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2009-11-17T16:50:19+01:00
L=2*pi*r
L=25.12
25,12=2*3.14*r
6.28r= 25.12 //: 6.28
r = 4

P=PI r[2]
P=3.14* 4[2]
P=3.14 *16
P=50.24 [j]kwadratowych
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2009-11-17T16:51:09+01:00
L = 2πr = 25,12m
r = l ÷ 2π = 25,12 ÷ (2 × 3,14) = 4m

P = πr² = 3,14 × (4m)² = 50,24m²

pozdr ;)
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