The perimeter of the rectangle is 256cm. The length of this rectangle is 58cm. How wide is it?

The sum of all sides of a rectangle is expressed by the formula:

P = 2a + 2b. We know that this value is 256 cm and length = 58 cm.

Let us express the width from the formula, for this we subtract the first term from the sum:

2b = P – 2a = 256 – 2 * 58 = 256 – 116 = 140. To find the second factor, divide the product by the first:

b = 140: 2 = 70 cm.