PERT Practice Test 2026 – Complete Guide for Exam Prep

Question: 1 / 400

How is the perimeter of a rectangle calculated?

By multiplying length by width

By subtracting length from width

By adding the lengths of all sides or using the formula P = 2(l + w)

The perimeter of a rectangle is calculated by either adding the lengths of all the sides together or by using the formula \( P = 2(l + w) \). This formula reflects the fact that a rectangle has two pairs of equal-length sides: the lengths and the widths.

When you add the lengths of all sides, you are essentially counting each side twice, which is why the formula simplifies to \( 2(l + w) \). Here, \( l \) represents the length of the rectangle, and \( w \) represents the width. By using this approach, you ensure that you account for the complete distance around the rectangle, providing an accurate measurement of its perimeter.

This understanding helps in solving various problems related to geometry where the perimeter is a necessary value for calculations such as fencing, tiling, or understanding space.

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By finding the average of all sides

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