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2r=1cm
r=½cm
pole=πr²=π×(½)²=¼πcm²
b]2πr=½πm/:π
2r=½m
r=4m
pole=πr²=π4²=16πm²
c]2πr=50πcm/:2π
r=25cm
pole=πr²=π×25²=625πcm²