High School Math : How to find the perimeter of an acute / obtuse isosceles triangle

Study concepts, example questions & explanations for High School Math

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Example Questions

Example Question #1 : Isosceles Triangles

One side of an acute isosceles triangle is 15 feet.  Another side is 5 feet.  What is the perimeter of the triangle in feet?

Possible Answers:

Correct answer:


Because this is an acute isosceles triangle, the third side must be the same as the longer of the sides that you were given.  To find the perimeter, multiply the longer side by 2 and add the shorter side.

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