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x= 1 z katów ostrych
90-x= drugi kat ostry
90-x=½(90+x)
90-x=45+½x
-x-½x=45-90
-1,5x=-45
x=45:1,5
x=30
90-30=60⁰
trójkąt ma kąty:90,60 i 30⁰