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2009-06-04T14:13:31+02:00
R=4√3
α=60°
β=120°

Oblicz P
a/2=Rsinβ/2=R*√3/2
b/2=Rsinα/2=R*1/2
h=Rcosα/2-Rcosβ/2=R(√3/2-1)

P=(a/2+b/2)*h=R²(√3/2+1/2)*(√3/2-1/2)=R²(3/4-1/4)
P=1/2R²=8*3=24
P=24j²

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