Find the perimeter of rectangle ABCD with sides AB = 15cm BC = 20cm.

To complete this task, remember that the perimeter of a rectangle is equal to the sum of the lengths of all its 4 sides. Based on the fact that a rectangle has two equal sides, then to find its perimeter, you need to find the doubled sum of the length and width. Find the perimeter of a rectangle 20 cm long and 15 cm wide.
P = 2 * (20 + 15) = 2 * 35 = 70 centimeters.
Answer: 70 cm.

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