If a rectangle has a length of 10 cm and a width of 5 cm, what is its perimeter?

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

Perimeter = 2 × (length + width).

In this case, the length of the rectangle is 10 cm and the width is 5 cm. Plugging these values into the formula gives:

Perimeter = 2 × (10 cm + 5 cm) = 2 × 15 cm = 30 cm.

Therefore, the perimeter of the rectangle is 30 cm, making the second choice the correct answer. This result reflects the total distance around the rectangle, which combines both the lengths and widths according to the perimeter formula.