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P=1/2ab\\
60 = 1/2a*(a+7)
120 = a²+7a
a²+7a-120 = 0
Δ=7²-4·(-120) = 49+480 = 529
√Δ = √529 = 23
a=[-7+23]/2=8
b=a+7=15
c²=a²+b² = 8²+15² = 64+225 = 289
c=√c² = √289 = 17 cm