In order to find the perimeter of our rectangle, recall the formula for finding the perimeter of a rectangle. P = (a + b) * 2, where P is the perimeter of the rectangle, a is the length of the rectangle, b is the width of the rectangle. Let us have a = 30 mm, b = 20 mm. Next, using the formula, we find the perimeter of our rectangle. (30 + 20) * 2 = 100 (mm.) – the perimeter of the rectangle. We need to express the answer in centimeters. Knowing that there are 10 millimeters in one centimeter. 100 mm = 10 cm.
Answer: 10 centimeters.
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