pls explain how to do this .....thanks
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Answer:- 14cm
Step-by-step explanation:
Area of outer circle -Area of inner circle=Area enclosed between them.
so, πR²-πr²=770cm²
22/7x(21)²-22/7xr²=770cm²
22/7x441-770=22/7r²
(22x63)-770=22/7r²
1386-770=22/7r²
616/22/7=r²
616x7/22=r²
4315/22=r²
196=r²
r=√196
>>r=14cm
I hope it helps you
please mark this as brainliest
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