Question

Find the value of x. Round your answer to the nearest tenth, if needed.
20
18

Answer 1

21.9

Explanation:

The altitude of an isosceles triangle bisects the base. So, x represents the hypotenuse of a right triangle with legs of 9 and 20. It can be found using the Pythagorean theorem:

x^2 = 9^2 +20^2 = 81 +400

x = √481 ≈ 21.932