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a) 2 cm,
p=πr²
p=π2²
p=4πcm²
b) 10 cm,
p=πr²
p=π10²
p=100πcm²
c) 5m
p=πr²
p=π5²
p=25πm²
d) 40 cm
p=πr²
p=π40²
p=1600πcm²
e) 0,1 dm
p=πr²
p=π(0,1)²
p=0,01πdm²
f) 1/5 m
p=πr²
p=π(1/5)²
p=1/25 πm²