Find the value of x in the triangle

The triangle is an isosceles triangle, meaning that two of the sides are equal.

Let's call the two equal sides x.

The third side is 8.

We can use the Pythagorean Theorem to solve for x:

x2 + x2 = 82

2x2 = 64

x2 = 32

x = √32

x = 5.66