9 Perimeter & Area
Perimeter
Example 1
Find the perimeter of a square which has a side measuring 8 inches.
Step 1: Write down the formula.
Perimeter = side + side + side + side
Step 2: Solve for perimeter.
Perimeter = 8 + 8 + 8 + 8
Perimeter = 32 inches
Example 2
Find the perimeter of a rectangle if the length is 12 and the width is 7.
Step 1: Write down the formula
Perimeter = (length × 2) + (width × 2)
Step 2: Solve for perimeter
Perimeter = (7 × 2) + (12 × 2)
Perimeter = 14 + 24
Perimeter = 38
Area
Square
Area = side × side
Area = 5 inches × 5 inches
Area = 25 in2
Rectangle
Area = length × width
Area = 22 inches × 15 inches
Area = 330 in2
Text Attributions
This chapter uses content from “Perimeter” and “Area” in Math for Trades: Volume 2 by Chad Flinn and Mark Overgaard, which is licenced under a CC BY 4.0 licence.