In this video tutorial, the instructor demonstrates how to determine the number of diagonals in a regular polygon by looking at the number of vertices, and the number of diagonals. Use the formula to complete the assessment to check...

In this video tutorial, the instructor uses data to derive the formula to solve for number of diagonals in a regular polygon. Assess understanding with a quiz. [5:43]

The fact that that when both diagonals are drawn in on a square, four congruent 45-45-90 triangles are formed is discussed in this lesson. It is 4 of 5 in the series titled "Double Diagonals of a Square."

The fact that that when both diagonals are drawn in on a square, four congruent 45-45-90 triangles are formed is discussed in this lesson. It is 1 of 5 in the series titled "Double Diagonals of a Square."

The fact that that when both diagonals are drawn in on a square, four congruent 45-45-90 triangles are formed is discussed in this lesson.