1. Thursday, October 13th You need: calculator, protractor, and ruler
Turn in yesterday’s homework!
Warm-Up (below):
Parallelogram Investigation
Parallelogram Properties (with algebra)
Assignment: Properties of Parallelogram WS
WARM-UP-Fill in the blank: (Yes, write the entire sentence.)
A ______ is a polygon with 4 sides.
A ______ is a quadrilateral with opposite sides parallel.
A ______ is a quadrilateral with one set of opposite sides parallel.
When the properties of a _____ and _____ combine, you have a _________.

2. Parallelogram #1
Mark in with bold arrows, the opposite sides parallel. One set with one bold arrow and the other with two arrows so we know the difference between them.
Now with your ruler (using the unit of your choice), measure all four segments that make up the parallelogram.
What do you notice about them? Discuss as a team.

3. Parallelogram #2
Mark in with bold arrows, the opposite sides parallel. One set with one bold arrow and the other with two arrows so we know the difference between them.
With your protractor, measure all four angles in the parallelogram.
What do you notice about the opposite angles? Discuss as a team.
What do you notice about the consecutive angles? Discuss as a team.
What information could we have used to come up with these properties without measuring the angles with a protractor? (HINT: think parallel lines)

4. Parallelogram #3
Connect A to C and B to D to create the diagonals of a parallelogram. Mark the intersection point E.
With your ruler, measure the lengths of AC, BD, AE, EC, BE, and ED. What do you notice about the relationship?

5. Parallelogram #4 Opposite sides are parallel
Opposite sides are congruent
Opposite angles are congruent
Consecutive angles are supplementary
Diagonals bisect each other
Let’s mark all of the properties of a parallelogram on #4.