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P=πr²
P=1,21π
3π=2πr
r=3/2
P=3π
3π/4=2πr
3π=8πr
3π/8π=r
P=π(3π/8π)²
2. r=1,8dm
P=3,24π
4π=2πr
r=2
P=4π
a) r = 1,1 m
P = π * (1,1)² = 1,21π m ²
b) r = 1,8 dm
P = π * (18)² = 324 π cm²