Instructional video

Use parallel lines and triangle congruence theorems to prove properties of diagonals within parallelograms

teaches Common Core State Standards HSG-CO.C.11 http://corestandards.org/Math/Content/HSG/CO/C/11

Use parallel lines and triangle congruence theorems to prove properties of diagonals within parallelograms

In this lesson you will learn how to prove the properties of diagonals within parallelograms by using parallel lines and triangle congruence theorems.