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2r = 24cm
H = 15cm = 1,5dm
r = 12cm = 1,2dm
V = πr² × H
V = (1,2)² ×1,5
V = 1,44 ×1,5π
V = 2,16π
π = 3,14
3,14 ×2,16 = 6,78[l] ≈ 7[l]
zad 25/179
dane:
a=10cm
a=H
a=2πr² /:2π
r=a/2π
r=10/2π
r=5/π
Pc=2π(5/π)²+100
Pc=2π × 25/π² + 100 [
Pc=50π/π² + 100(ulamek)
Pc= 50/π +100[cm²]
Pc= 50/3,14 +100 = 115,9[cm²]