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α-kat między bokiem a i b
a)
a=6
b=10
α=30°
P=¹/₂·6·10·sin30°=30·¹/₂=15
b)
a=√3
b=4√3
β=35°
γ=100°
α=180°-35°-100°=45°
P=¹/₂·√3·4√3·sin45°=¹/₂·4·√3·√3·sin45°=2·3·√2/2=6·√2 /2=3√2