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2009-09-19T13:20:19+02:00
2Πr= c
r= c/2Π

Πr² = Π (c/2Π)² =Π c²/4Π² = c²/4Π
2009-09-19T13:31:46+02:00
2*pi*r= C
r= C/2*pi

P=pi*r² = pi*(C/2*pi)² =pi*C²/4*pi² = C²/4*pi
2009-09-19T14:00:10+02:00
P=πr2
L=2 πr
L=C
2πr=C/2π
r=C/2π
P= π(C/2π) 2
P= π* C 2/4 π2
P= π C 2/4 π2