Find the area of a rectangle if its perimeter is 16cm and its width is 3cm.

1. Let’s say the length of the rectangle is x centimeters. The perimeter of the rectangle is determined by the formula p = (a + b) * 2. From the condition, the perimeter value and the width of the rectangle are known. To calculate the length, compose an equation.

16 = (x + 3) * 2;

16/2 = x + 3;

8 – 3 = x;

x = 5 centimeters.

2. Find out the size of the area.

5 * 3 = 15 cm².

Answer: 15 square centimeters.