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x= jeden z kątów ostrych
x-90=drugi kąt ostry
x=½(90+90-x)
x=-½x+90
x+½x=90
1½x=90
x=90;1,5
x=60
90-x=90-60=30
kąty mają:90;60 i 30⁰
90 (stopni) +x= 2y
x=90-y
180-y=2y
3y=180
y= 60
x=90- 60
x=30