1. 5.4 Special Quadrilaterals

2. Rectangles What is a rectangle by definition?
A Quadrilateral with four right angles.
Why is every rectangle a parallelogram?
Because both pairs of opp. angles are

3. RHOMBUS What is a rhombus? A Quadrilateral with four congruent sides.
Why is a rhombus a parallelogram?
Because both pairs of opp. sides are

4. SQUARE
What is a square?
A Quadrilateral with four right angles and four congruent sides.
Why are all squares parallelograms?
Because both pairs of opp. sides AND/OR angles are

5. Diagonals! All diagonals of a rectangle are congruent.
The diagonals of a rhombus are perpendicular.
Each diagonal of a rhombus bisects two angles of the rhombus.

6. What if?
What if an angle of a parallelogram is a right angle? DRAW IT!
What if two consecutive sides of a parallelogram are congruent? DRAW IT!

7. Quad. ABCD is a rhombus.

8. Quad. FGHI is a rectangle.12
90 – 29 12 12

9. Medians from an Altitudex
x = 28
y = 28 y 28

10. Complete the worksheet.