1. Parallelogram Notes
MCC9-12.G.CO.11

2. The prefix QUADR means 4.
Quadrant
Quadruple
Quadricepts
Quadrilateral

3. To name a quadrilateral...
list the vertices in order, like the
sweeping hands of a clock.
QUAD
UADQ U Q
ADQU A D
DQUA

4. Consecutive C B
Consecutive
Sides A D
One after the other

5. Consecutive C B
Consecutive
Vertices A D
One after the other

6. Segment with two nonconsecutive vertices
Diagonal C B A D
Segment with two nonconsecutive vertices

7. Find x.

8. Find x.

9. Types of Angles Review Corresponding Angles Alternate Interior Angles
Alternate Exterior Angles
Consecutive Interior

10. You MUST memorize (learn) the 5 properties of parallelograms.

11. 5 properties of Parrallegrams
1. Opposite sides of a parallelogram are parallel.
2. Opposite sides of a parallelogram are congruent.
3. Opposite angles of a parallelogram are congruent.
4. Two consecutive angles of a parallelogram are supplementary.
5. Diagonals of a parallelogram bisect each other.

12. Opposite angles are congruent
5-8 Parallelograms
Opposite angles are congruent

13. Consecutive angles are supplementary.
ADD UP TO 180
Consecutive angles are supplementary.

14. Opposite sides are congruent

15. Diagonals bisect each other.
This cuts the diagonals into two equal parts.

16. 23 K L 15 N M

17. 23 K L 15 N M

18. 23 K L 15 N M

19. K L P N M

20. How do you know if you have one?

21. Is this a parallelogram?
How do you know for sure?

22. Is this a parallelogram?
How do you know for sure?

23. Is this a parallelogram?
How do you know for sure?

24. Do you have enough information?
Yes
Yes 6 No
Yes

25. Do you have enough information?
50°
130°
Yes No
Yes
Yes