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a - kat wpisany
2a - kąt środkowy
a+2a=180
3a=180
a=180/3
2a=2*60
2a=120 miara kąta środkowego
a1=x-1
a2=4
a3=8
a1+a3=2*a2
x-1+8=2*4
x=8-8+1
x=1
3.
a1=-8
a2=4
a3=x+1
a1*a3=a2²
-8(x+1)=4²
-8x-8=16
-8x=16+8
x=24/(-8)
x=-3