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If the base of an isosceles triangle is 11 and its perimeter is 39, then it has a height of 12.87.

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Q: If the base of an isosceles triangle is 11 and the perimeter is 39 what is the length of a leg?
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What is the perimeter of the isosceles triangle with base length y-3 and legs of length y?

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In effect what you are asking is "does 5 + 5 + 5 = 6 + 6 + 3?" which of course it does. Is it the word perimeter that caused confusion?


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