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a). r=14
L=4πr²=4.22/7.14.14=2464 cm²
b).r=5
L=4πr²=4.3,14.5.5=314 cm²
c). d=7
L=πd²=22/7.7.7=154 cm²
d). d=8
L=πd²=3,14.8.8=200,96 cm²
2).
a). d=22
L=πd²=3,14.22.22=1519,76 cm²
b). d=24
L=πd²=3,14 .24 .24=1808,64 cm²