Odpowiedzi

2009-11-28T19:14:18+01:00
P = (α/360⁰)×πr²
α = 72⁰
r=3
P = (72⁰/360⁰)×9π
P = 9/5 π

ł = (α/360⁰)×2πr
ł = (1/5)×6π
ł = 6/5 π