1. 6-4 Properties of Rhombuses, Rectangles and Squares Objectives: To define and classify types of parallelograms To use properties of diagonals of rhombuses and rectangles Essential Understanding : Parallelograms have basic properties about their sides and angles that help identify them.

2. Definitions Diagrams A rhombus is a parallelogram with four congruent sides. A rectangle is a parallelogram with four right angles. A square is a parallelogram with four congruent sides and four right angles.

5. Diagonals of rectangles also have special properties. 6-4 p. 379: 7-37 odd