Using the Pythagorean Theorem with a Rectangle

The video tutorial explains how to solve a standardized math test question using the Pythagorean theorem. It begins by introducing the problem involving a rectangle and its diagonal, then explains the properties of rectangles and right triangles. The tutorial demonstrates how to apply the Pythagorean theorem to find the missing side of the triangle, and concludes with calculating the diagonal length by finding the square root of the sum of the squares of the other two sides.

Explain how to find the square root of a number in the context of the Pythagorean theorem.

What is the value of X when the legs of the triangle are 15 and 20?