If a rectangle has a length of 10 cm and a width of 4 cm, what is its perimeter?

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To find the perimeter of a rectangle, the formula used is ( P = 2 \times (length + width) ). In this case, the length is 10 cm and the width is 4 cm.

First, add the length and width together:

( 10 , \text{cm} + 4 , \text{cm} = 14 , \text{cm} ).

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

( P = 2 \times 14 , \text{cm} = 28 , \text{cm} ).

This calculation shows that the perimeter of the rectangle is indeed 28 cm, which is why that answer is correct.