For this lesson, we are going to use the theorems and the properties you learned in the previous lesson to prove parallelograms. First we will turn the properties that we learned into actual theorems. The first theorem we'll cover says that if both pairs of opposite sides of a quadrilateral are congruent, then the quadrilateral is a parallelogram. Similarly, if both pairs of opposite angles of a quadrilateral are congruent, then the quadrilateral is a parallelogram. There are also theorems on diagonals, and opposite sides of a quadrilateral. You'll see how to apply these and prove parallelograms.
*These practice questions are only helpful when you work on them offline on a piece of paper and then use the solution steps function to check your answer.
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.