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20πm²=π(r-2m)²
20πm²=πr²-4πm²
20πm²-4πm²=πr²
16πm²=πr² /π
16m²²=r² √
r=4m
20πm²=π(r-2m)²
20πm²=πr²-4πm²
20πm²-4πm²=πr²
16πm²=πr² /π
16m²²=r² √
r=4m