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P=1/2ah
P=60
1/2*h*(h+7)=60
h²+7h=120
h²+7h-120=0
Δ=49+480=529
√Δ=23
h₁=(-7-23):2=-30;2=-15 sprzeczne
h₂=(-7+23):2=16:2=8
a=8+7=15
a²+h²=c²
15²+8²=c²
c²=225+64=289
c=17