What is the perimeter of a rectangle that is 5 units wide and 10 units long?

To determine the perimeter of a rectangle, the formula used is P = 2(length + width). For the rectangle in question, the width is 5 units and the length is 10 units.

First, calculate the sum of the length and the width:

10 units (length) + 5 units (width) = 15 units.

Next, multiply this sum by 2 to find the perimeter:

P = 2 * 15 units = 30 units.

This calculation indicates that the correct perimeter is 30 units.

The answer provided does not reflect the accurate calculation based on the dimensions of the rectangle, which directly leads to the proper application of the formula for finding perimeter. Understanding this formula is critical, as it highlights how the dimensions of a rectangle are used to find its perimeter, reinforcing the foundational concept in geometry concerning two-dimensional shapes.