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Perimeter of triangle. I don't understand what I did wrong, please help
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5 votes
Perimeter of triangle. I don't understand what I did wrong, please help

Perimeter of triangle. I don't understand what I did wrong, please help-example-1
User RWC
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1 Answer

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This is an isosceles triangle, so 3x-5 = 19-x. Thus, 4x=24, and x=6.

Thus, the 3 sides of the triange are 3(6)-5, 19-6 and 2(6), or 13, 13 and 12.

The perimeter is the sum of these three side lengths: 13+13+12 = 38 (ans.)
User David Dossot
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