∢AOC=144⁰
r=10cm
L=α/360⁰*2πr
L(ABC)=144/360*2*10cmπ
L(ABC)=0,4*20cm*3,14=25,12cm
∢AOC(wklęsły)=360⁰-144⁰=216⁰
L(ADC)=216/360*2*π*10cm
L(ADC)=0,6*20cm*3,14=37,68cm
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∢AOC=144⁰
r=10cm
L=α/360⁰*2πr
L(ABC)=144/360*2*10cmπ
L(ABC)=0,4*20cm*3,14=25,12cm
∢AOC(wklęsły)=360⁰-144⁰=216⁰
L(ADC)=216/360*2*π*10cm
L(ADC)=0,6*20cm*3,14=37,68cm