The width of the rectangle is 3 cm. It is 20 mm less than its length. Find the area of the rectangle.

Consider the condition of this problem. When solving, geometric formulas will be applied. Let’s find a solution to the task by actions with detailed explanations for each of them:

1.Calculate the width of the rectangle, provided that it is 20 mm less than the length of the rectangle. We transform the values: 20 mm = 2 cm, because 1 cm = 10 mm. The width of the rectangle = 3 – 2 = 1 cm.

2. Area of the rectangle = width × length. Substitute the numerical values into the formula and calculate what the area is equal to: area = 3 × 1 = 3 cm².

Answer: the area of the rectangle is 3 cm².