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a) 16πcm²=πr² /:π
16=r²
r=4 cm
b) 10 cm²=πr² /:π
10/π=r²
r=√10/π cm
c) 400 m ²=πr² /:π
400/π=r²
r=√400/π
r=20√π /π m
r=8cm
b) 10 cm² = 2πr
r=ok. 1,59cm (5/π cm)
c) 400 m ² = 2πr
r=ok. 63,69m (400/2π cm)
a) P = 16πcm²
Podstawiamy pod wzór:
16π = π * r² | :π
16 = r²
r = √16
r = 4 (cm²)
Spr.
P= π * 4²
P = 16π