1. Do Now: Put your cross word in my basket
Are these two line perpendicular, parallel or neither?
What is the name quadrilateral with exactly one pair of parallel sides?

2. Homework

3. Coordinate Geometry

4. When developing a coordinate geometry proof:
Draw and label the graph
Read the question and decide what steps you will need in order to complete the proof
State the formulas you will be using
Show ALL work (if you are using your graphing calculator, be sure to show your screen displays as part of your work.)
Have a concluding sentence stating what you have proven and why it is true
(∴ means therefore to create a concluding sentence)

5. Prove that A(1,1), B(4,4), C(6,2) are the vertices of a right triangle.

6. Let’s first just prove the quadrilateral is a trapezoid
Prove that quadrilateral A(1,-2), B(13,4), C(6,8) and D(-2,4) is a trapezoid, but is NOT an isosceles trapezoid.
Let’s first just prove the quadrilateral is a trapezoid

7. Now let’s prove it is not an isosceles trapezoid
Prove that quadrilateral A(1,-2), B(13,4), C(6,8) and D(-2,4) is a trapezoid, but is NOT an isosceles trapezoid.
Now let’s prove it is not an isosceles trapezoid

8. Prove that A(-3,2), B(-2,6), C(2,7) and D(1,3) is a rhombus.

9. Jen and Dan see a drawing of quadrilateral ABCD,  A(2,2), B(5,-2), C(9,1) and D(6,5).Dan says the figure is a rhombus, but not a square.  Jen says the figure is a square.  Write a proof to show who is making the correct observation.

10. One Last Thing…
Hand it into the basket and pick up your homework sheet
If you need help PLEASE ASK!!!