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

Answer: the perimeter of the rectangle is 70 cm.
One of the properties of a rectangle is that its two opposite sides are equal. If we have given the values of two sides of different lengths, then the unknown sides will be equal to the opposite.
The perimeter of any polygon is the sum of the lengths of all sides. In this way:
15 + 15 + 20 + 20 = 70 cm.



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