A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

$21 π m^{2}$

$100 π m^{2}$

$31 π m^{2}$

$121 π m^{2}$

বুয়েট ও অন্যান্য পরীক্ষা2024ক্ষেত্রফল ও পরিসীমাসাধারণ গণিতপরিমিতি ও ঘনবস্তু

লগইন করুন

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?

A circular garden with diameter of 20 meters is surrounded by a walkway of width 1 meter. What is the area of the walkway?