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x²=4,2²-2,5²
x²=17,64-6,25
x²=11,39
x=0,1√1139
kąt:QRP=α
sinα=2,5:4,2
sinα=0,595238
α=36⁰
kąty trójkąta:90;36 i 180-(90+36)=180-54⁰