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

## Example Questions

2 Next →

### Example Question #11 : Triangles

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

inches

inches

inches

inches

inches

inches

Explanation:

To find the perimeter of this triangle, apply the perimeter formula:

Since, , and  then  must have a value of:

This triangle has two side lengths of  inches, and one side length of  inches.

Thus, the solution is:

### Example Question #12 : Isosceles Triangles

A triangle has two sides with length  and one side length . The length of side   yard. If the length of   the length of side , what is the perimeter of the triangle?

yard

yard

yard

yard

yard

yard

Explanation:

The first step to solving this problem is that we must find the length of length  Since,  is 4 the length of side , use the following steps:

Now, apply the formula:

2 Next →

Tired of practice problems?

Try live online GRE prep today.