SLOWLY slide the dragging tool. Notice that the trapezoid is being doubled and rearranged to form a parallelogram. The height of this parallelogram is the height of the trapezoid, the length of the parallelogram is not as clear. [br][br]What do you think the length of this parallelogram is?

The area of the trapezoid is going to be ______ the area of the parallelogram.

Knowing this, which of the following formulas can you deduce will be the formula to find the area of a trapezoid?