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∢ACS=15⁰
∢ASC=180⁰-30⁰=150⁰
∢ASC=360⁰-150⁰=210⁰ wklęsły środkowy
wpisany ∢ABC=210⁰:2=105⁰
∢CAB=50⁰
∢BCA=180⁰-105⁰-50⁰=25⁰