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r= √3
W = 120/360 x 3 = 1π
l = 2πr
1π = πr₂
r = 1
l = 2π
Pc = πr² +πrl = 1π + 2 x 1π = 3π
α=120st
Pc=?
Dlugosc luku
l=120/360*2πR=2/3πR
obliczam promien podstawy
2πr=2/3πR---->r=1/3R
Pb=1/3πR²
Pp=πr²
Pc=1/3πR²+1/9πR²=πR²(3/9+1/9)=4/9π*3=4/3πcm²