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e) alfa = 72° 180°=2,5alfa, alfa=180°/2,5
α-to będzie Y
pierwszy trójkąt:
x + x - 30 + 90 = 180
2x - 30 + 90 = 180
2x = 180 + 90 - 30
2x = 240
x = 240 : 2
x = 120
β=120
drugi trójkąt
y + y + ½y = 180
2½y = 180
y = 180 : 2½
y = 72
90⁰+β+β-30⁰ = 180⁰
60⁰+2β = 180⁰ / -60⁰
2β=120⁰ / ÷2
β = 60⁰
e)
α+α+½α = 180⁰
2½α = 180⁰
α = 72⁰