# Lesson Plan: Properties of Parallelograms Mathematics

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to determine whether a quadrilateral is a parallelogram and use the properties of parallelograms to find unknown angles or lengths.

#### Objectives

Students will be able to

• recognize the following properties of a parallelogram,
• opposite sides are parallel,
• opposite sides are equal in length,
• opposite angles are equal in measure,
• the sum of two adjacent angles is ,
• the diagonals bisect each other,
• identify the following special cases of a parallelogram,
• rectangles,
• rhombuses,
• squares,
• use the properties of quadrilaterals to find missing lengths and angles in geometric figures.

#### Prerequisites

Students should already be familiar with

• properties of rectangles and squares,
• using geometric notation for line segments, line lengths, angles, and angle measures,
• parallel and perpendicular lines.

#### Exclusions

Students will not cover

• finding angles (other than right angles) formed by intersecting diagonals (e.g., finding the angle formed by the diagonals of a rectangle).