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a-podstawa trójkąta
h=a-8 wysokość trójkąta ∧-delta
P=½*a*h
90=½*a*(a-8)
180=a²-8a
a²-8a-180=0
∧=64+720
√∧=28
a=8-28*½=-10∉D
a₁=8+28*½=18
a=18
h=a-8=10
c²=h²+½a²
c²=10²*9²
c²=100+81
c²=181
c=26√3
a=18
h=10