1. Please take Module 9 from the ChromeBook cart.

2. p. 419 3 Conjectures About Parallelograms:
Opposite sides of a parallelogram are congruent.
Opposite angles of a parallelogram are congruent
The diagonals of a parallelogram bisect each other

7. (First find x)

8. Def. of a parallelogram:
- A quadrilateral with 2 pairs of parallel sides.
If a quadrilateral is a parallelogram then. . .
- Opposite sides are congruent
- Opposite angles are congruent
- Diagonals bisect each other

9. Find all the missing angles in the parallelogram.
Same-side Interior Angle Postulate – If lines are parallel, same-side int. angles are supplementary.

10. Use the parallelograms to find the following:
1) If mBCD = 125, find mBAD.
2) If mABC = 50, find mBCD.
3) If AB = 5x – 3 and CD = 2x + 9, find AB.
4) If mBCD = x + 40 and mBAD = 3x – 12, find mBAD.
5) Find x and y.
125
130 17 66
x = 20, y = 12