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Let the length of a leg be x. There are three sides: the base which is 11, and the legs, which are both x:

11 + x + x = 39

2x+11 = 39

2x = 39-11

2x = 28

x = 28/2

x = 14

The length of one leg is 14 units.

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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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