Emilio is designing the packaging for a new MP3 player. The box for the MP3 player is 5 cm by 3 cm by 2 cm. Emilio needs to find the surface area of the box.

Look at how Emilio solved the problem. Find his error.

STEP 1 : Draw a net.

STEP 2 : Find the areas of all the faces and add them.

Face A : \(3\times2 = \color{red}{6}\text{ cm}^{2}\).

Face B : \(3\times5 = \color{red}{15}\text{ cm}^{2}\).

Face C : \(3\times2 = \color{red}{6}\text{ cm}^{2}\).

Face D : \(3\times5 = \color{red}{15}\text{ cm}^{2}\).

Face E : \(3\times5 = \color{red}{15}\text{ cm}^{2}\).

Face F : \(3\times5 = \color{red}{15}\text{ cm}^{2}\).

The surface area is \(6 + 15 + 6 + 15 + 15 + 15 = \color{red}{72}\text{ cm}^{2}\).

Correct the error. Find the surface area of the prism.

For numbers 9a–9d, select True or False for each statement.

9a. The area of face A is \(10\text{ cm}^{2}\).

9b. The area of face B is \(10\text{ cm}^{2}\).

9c. The area of face C is \(40\text{ cm}^{2}\).

9d. The surface area of the prism is \(66\text{ cm}^{2}\).