The perimeter of the rectangle is 126 millimeters and the width is 29 millimeters. What is the length of the rectangle?

Since the opposite sides of the rectangle are equal, its perimeter is calculated by the formula:
P = 2a + 2b.
Provided that this value is 126 mm, and the width = 29 mm, we express the length of such a figure:
a = (P – 2b): 2 = (126 – 2 * 29): 2 = 68: 2 = 34 mm.

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