# math

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A triangle whose sides are 5,12, and 13 inches is similar to a traingle whose longest side is 39 inches. What is the perimeter of the larger triangle?

• math -

the perimeter of two similar triangles is proportional to the ratio of their sides

ratio of sides = 13:39 = 1:3

the perimeter of the smaller is 30
so the perimeter of the larger is 90.

• math -

32

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