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]

Explore how to solve for the diagonal length of a rhombus when given the area. Assess learning with a quiz.

This video lesson demonstrates two ways for calculating the area of a rhombus. Students can check their understanding with an assessment. [4:55]

This lesson provides a video that shows examples of various quadrilaterals in the real world. A notes sheet follows describing the characteristics of each quadrilateral and how to find the area of several figures. [3:37]

Proof that the diagonals of a rhombus are perpendicular bisectors of each other.

This lesson cover the concept that that when both diagonals are drawn in on a parallelogram, two pairs of congruent triangles are formed. It is 4 of 5 in the series titled "Double Diagonals of a Parallelogram."

This lesson cover the concept that that when both diagonals are drawn in on a parallelogram, two pairs of congruent triangles are formed. It is 1 of 5 in the series titled "Double Diagonals of a Parallelogram."

Following this lesson, you'll know that when both diagonals are drawn in on a rectangle, two pairs of congruent isosceles triangles are formed. It is 3 of 5 in the series titled "Double Diagonals of a Rectangle."

Following this lesson, you'll know that when both diagonals are drawn in on a rectangle, two pairs of congruent isosceles triangles are formed. It is 4 of 5 in the series titled "Double Diagonals of a Rectangle."

Following this lesson, you'll know that when both diagonals are drawn in on a rectangle, two pairs of congruent isosceles triangles are formed. It is 1 of 5 in the series titled "Double Diagonals of a Rectangle."

This lesson cover the concept that that when both diagonals are drawn in on a parallelogram, two pairs of congruent triangles are formed.

Following this lesson, you'll know that when both diagonals are drawn in on a rectangle, two pairs of congruent isosceles triangles are formed.

The instructor of this video lesson demonstrates how to find the number of diagonals in a regular polygon using a formula. [3:01]