GRE Math : How to find the perimeter of an acute / obtuse triangle

Study concepts, example questions & explanations for GRE Math

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Example Questions

Example Question #1 : Acute / Obtuse Triangles


The obtuse Isosceles triangle shown above has two sides with length  and one side length . The length of side  . The length of side . Find the perimeter of the triangle. 

Possible Answers:

Correct answer:


To solve this problem, apply the formula: 

Side , side  must equal 

Since this is an Isosceles triangle, there must be two sides with a length of .

Thus, plug in each side lengths value to find the solution:

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