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2 kąt ½x 30
3 kąt x 60
x+½x+90=180
x+½x=90
1½x=90
³/₂x=90 razy 2
3x= 180
x=60
:)
90°+α= 2α
90°=2α +α
90°=3α/:3
α= 30°