# Section 12.4: Activity 12G

- Author:
- Erika Bratcher, Erika Bratcher

## Problem 1

The three parallelograms below all have two sides that are 3 units long and two sides that are 7 units long.
(a) Use the moving and additivity principles to determine the areas of the three parallelograms.
(b) Can there be a formula for areas of parallelograms that is only in terms of the lengths of the sides?

## Problem 2

Find a formula for the area of a parallelogram

*in terms of lengths of parts of the parallelogram*.