1. Proving Quadrilaterals on the Coordinate Plane February 27, 2013

2. Prove that the quadrilateral ABCD with vertices A(-5, -1), B(-9,6), C(-1,5), and D(3,-2) is a rhombus.

3. Do the work (Calculations) Find the Slopes of the sides.

4. Do the work (calculations Find the Lengths of the Sides

5. So Why is it a Rhombus? Cause it looks like one. The sides are equal. It’s a rhombus.

6. So Why is it a Rhombus?

7. 2. Prove that ABCD with A(–5, 0), B(2, –4), C(6, 3), and D(–1, 7) is a rectangle. Get into your groups of 4 and discuss and solve the second problem.

8. Prove that ABCD with A(–5, 0), B(2, –4), C(6, 3), and D(–1, 7) is a rectangle.

10. Possible Answer