CPM Homework Help : CC1MN Problem 9-20

The area of the rectangle at right is $8\frac{1}{4}$ square inches. Find the perimeter. Show your work.

A rectangle with a length of 4 and one half inches.

Hint:

1. The area is the length times the width.
2. The perimeter is the distance around the outside of the shape.

Step 1:

Copy the problem and label what you need to find. A rectangle with a length of 4 and one half inches. The other sides are labeled with a question mark.

Step 2:

Label the area and the other known side. Changed on the rectangle: 4 and one half inches, on top, instead of question mark, and 8 and one quarter square inches, in the interior of the rectangle.

Step 3:

Convert the fractions to improper fractions. Changed on the rectangle: 9 halves, instead of 4 and 1 half, on top and bottom, 33 fourths, instead of 8 and 1 fourth, in the interior.

Step 4:

Find the width.
Then add all of the sides to find the perimeter. Changed on the rectangle: 11 sixths on the right and left side, instead of question marks.