Area of a Parallelogram

In this worksheet there two polygons; a rectangle and a parallelogram. Use the polygons to complete the investigation below.
Investigation: 1) Change the height of the rectangle (h) by moving point C. What happens to the height of the parallelogram? 2) Change the width of the rectangle by moving point L. What happens to the parallelogram? 3) Find the area of 3 different rectangles and compare the area of each rectangle to the area of the corresponding parallelogram. 4) What conjecture can you make about the formula for area of a parallelogram and why? (use the answer to question 3 to guide you)