1. Rhombuses, Rectangles, & Squares Sec 6.4 Continued GOALS: To use properties of diagonals for the rhombus, rectangle, and square

2. Theorem 6.11 A parallelogram is a rhombus if and only if its diagonals are perpendicular.

3. Theorem 6.12 A parallelogram is a rhombus if and only if each diagonal bisects a pair of opposite angles.

4. Theorem 6.13 A parallelogram is a rectangle if and only if its diagonals are congruent.

5. Example PQRS is a parallelogram. Find x

6. Example PQRS is a rhombus. Find x

7. Example WXYZ is a rectangle. The perimeter is triangle XYZ is 24. XY+YZ = 5x+1 and XZ = 13-x. Find WY.

8. Homework Page 353- See assignment guide