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a+B=180
a=B
środek
a=B
a+B=180
a+B=180
dół
a=B
a+B=180
a=B
1.α+β=180
2.α=β
3.α=β
4.α+β=180
5.α+β=180
6.α=β
7.α+β=180
8.α=β