California Assessment of Student Performance and Progress (CAASPP) Math Practice Exam

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If the perimeter of a square is 36 units, what is the length of one side?

8 units
9 units
10 units
12 units

The correct answer is: 9 units

To determine the length of one side of a square when its perimeter is given, it is essential to understand the relationship between the perimeter and the sides of a square. The perimeter of a square is calculated by adding together the lengths of all four sides. Since all sides of a square are equal in length, the formula for the perimeter can be expressed as: Perimeter = 4 × (length of one side). Given that the perimeter is 36 units, we can set up the equation: 36 = 4 × (length of one side). To find the length of one side, divide the total perimeter by 4: Length of one side = 36 ÷ 4 = 9 units. Thus, the length of one side of the square is 9 units, which aligns with the correct answer provided. This solution illustrates the procedure for calculating side length from perimeter in a square.