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16π=πr² /÷π
16=r² /÷√
r²=√16
r=4
b)
100π=πr² /π
r²=100 /÷√
r²=√100
r=10
P = πr²
16πcm²=πr²
√16 = r
r = 4
b)
100πcm²=πr²
r = √100 = 10