Math Expression: Perimeter of a Rectangle Practice Question

Given a rectangle with the length of 7cm and the width of 5cm. Find the area of this rectangle.

Step 1

The picture below shows the rectangle with the length of 7cm and the width of 5cm.
Step 2

To calculate the perimeter, we can use the formula for the perimeter of a rectangle:
Step 3

The length and the width of the rectangle are given as 7cm and 5cm respectively. Hence, we can substitute l with 7 and w with 5. After doing so, we can calculate for P, as shown below:
Step 4

Now, the calculated number 24, only has meaning if we include the unit for it. Since the length and width are in centimeter, the unit for perimeter will also be centimeter. Hence:

P = 24cm
Step 5

Clearly, the answer is A.