1. 6-4 Properties of Rhombuses, Rectangles, and Squares

2. Special Parallelograms

3. Problem 1: Classifying Parallelograms

5. Theorem 6-13
If a parallelogram is a rhombus, then its diagonals are perpendicular

6. Theorem 6-14
If a parallelogram is a rhombus, then each diagonal bisects a pair of opposite angles

7. Problem 2: Finding Angle Measures
What are the measures of the numbered angles in rhombus ABCD?

8. What are the measures of the numbered angles in rhombus PQRS?

9. Theorem 6-15
If a parallelogram is a rectangle, then its diagonals are congruent

10. Problem 3: Finding Diagonal Length
In rectangle RSBF, 𝑆𝐹=2𝑥+15 and 𝑅𝐵=5𝑥−12. What is the length of a diagonal?