Using the Pythagorean Theorem: Diagonal of a Square
As an easy application of the Pythagorean Theorem, I show how to calculate the diagonal of a square when the side of the square is given. This video lesson suits best grades 7-8 or a pre-algebra course.
See also
Using the Pythagorean Theorem 1: area of an isosceles triangle - a video lesson
Using the Pythagorean Theorem 3: volume of a triangular prism - a video lesson
Using the Pythagorean Theorem 4: perimeter of a trapezoid - a video lesson
Math Mammoth Grade 7 curriculum (pre-algebra)