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Use Pythagorean theorem to find isosceles triangle side lengths

Problem

Find the value of x in the isosceles triangle shown below.
A triangle with a base of 8 units and a height of x units. The other 2 sides of the triangle are 8 units. A dashed line goes from the center of the base straight up to the top vertex of the triangle. The bottom left angle and bottom right angle are congruent.
Choose 1 answer: