This lesson is on parallelograms; and before we talk about parallelograms, we will talk a little bit about quadrilaterals. A quadrilateral is a four-sided polygon. Remember that a polygon is a shape that is closed off. A parallelogram is a special type of quadrilateral, meaning that it is a four-sided polygon, but it has two pairs of parallel sides. The properties of parallelograms are given in the form of theorems. The first property is that opposite sides of a parallelogram are congruent. You'll also learn about the angle congruence, the consecutive angles in a parallelogram, and the diagonals of a parallelogram.
*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.