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dł. łuku:
1/4*2*π*12=6π
Pole:
1/4*π*12*12=36π
B)alfa=60stopni,r=15
1/6*2*π*15=5π
1/6*π*15*15=37,5π
C),alfa=120stopni,r=20
1/3*2*π*20=13 1/3π
1/3*π*20*20=133 1/3π
D),alfa=200,r=15.
5/9*2*π*15=16 2/3π
5/9*π*15*15=125π