What is the area of a rectangle with a length of 5 cm and a width of 3 cm?

To find the area of a rectangle, you can use the formula:

Area = Length × Width

In this case, the length of the rectangle is 5 cm, and the width is 3 cm. By substituting the given values into the formula, you have:

Area = 5 cm × 3 cm

Calculating this gives:

Area = 15 cm²

This shows that the area of the rectangle is indeed 15 cm², which corresponds to the first choice.

Understanding the reasoning behind the area calculation is crucial, as it is a fundamental concept in geometry that applies not only to rectangles but also to other shapes. The formula highlights the direct relationship between the dimensions of a rectangle and its area, emphasizing that the area grows as either the length or width increases.