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P=ah
45=15h
h=3 cm
sinα=3/6=1/2
α=30⁰
mamy więc kąty: 30⁰,30⁰, 150⁰,150⁰
a=15cm
b=6cm
P=15h=45 /:15
h=3cm
h/b=sinα
3/6=sinα
sinα=½
zatem α=30°
β=(360°-2α)/2=(360°-2*30°)/2=(360°-60°)/2=300°/2=150°
Kąty te mają wartość 30° 150° 30° 150°