All GRE Math Resources
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.
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: