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

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To find the perimeter of a rectangle, the formula used is:

Perimeter ( P = 2 \times (length + width) ).

In this case, the length of the rectangle is 5 cm and the width is 3 cm. Plugging these values into the formula gives:

( P = 2 \times (5 \text{ cm} + 3 \text{ cm}) )

( P = 2 \times 8 \text{ cm} )

( P = 16 \text{ cm} ).

Thus, the perimeter of the rectangle is 16 cm, which justifies why this is the correct answer.