1. Week 3
Warm Up
Add theorem 2.1 here next year. 3. 2

2. Re 1 4m - 7 = m + 14 3k - 2 = m + 9 3k - 2 = 7 + 9 3m = 21 3k - 2 = 16

3. A parallelogram with 4 congruent sides.
Section 6.4 Day 1
I will use properties of sides and angles of rhombuses, rectangles, and squares.
Rhombus
A parallelogram with 4 congruent sides.
Ex 1

4. 2y + 3
5y - 6
Ex 2
2y + 3 = 5y - 6
3 = 3y - 6
9 = 3y
3 = y

5. Theorem
Rhombus - Diagonals
A parallelogram is a rhombus if and only if its diagonals are perpendicular.

6. Rhombus – Bisect Opposite Angles
Theorem
Rhombus – Bisect Opposite Angles
A parallelogram is a rhombus if and only if its diagonals bisect a pair of opposite angles.

7. Theorem
Rectangle - Diagonals
A parallelogram is a rectangle if and only if its diagonals are congruent.

8. Ex 3
2( 5x ) = 180
10x = 180
x = 18º

9. Ex 4
Find WY
3x = x + 2
WY = x + 2
2x = 2
WY = 1 + 2
x = 1
WY = 3

10. What is the perimeter of ∆ HKJ?
Do 1:
Assignment:
Handout - 6.4B