# Using A&P Formulas to Solve for Dimensions

# Working Backwards

Your algebra skills meet your geometry skills when you use area and perimeter formulas to solve for missing dimensions.

## STEP 1: WATCH THE VIRTUAL CLASS VIDEO AND TAKE NOTES

### Make sure to note the following:

Prerequisite: You may want to review perfect squares before completing this lesson.

Have you been given the area or perimeter of a 2-dimensional shape and been asked to find a missing dimension like a length, width, height, base, or radius? Simply chose the correct formula from the GED® Formula Sheet, substitute in the known values, and solve for the missing dimension using your algebra skills learned in Unit 1.

Do you have a question about the class video, practice, or example problems? Post a picture to our FB group for immediate assistance. Be sure to include the lesson name and level in your post.

## STEP 2: COMPLETE ONE LEVEL OF PRACTICE

Straightforward formula sheet application problems that result in one-step equations.

Two and Three Step formula problems and circle application problems.

Multi-Step formula and application problems.