Cut and Glue

Geometry Level 2

What is the external surface area of this staircase (including the bottom) if it was constructed from four pieces of a cubic foot of wood?

Details: The height of part A is \(\frac{1}{3} \text{ ft}\) and the heights of parts B and C are \(\frac{1}{4} \text{ ft}\) each.

\[10 \frac{1}{3}\hspace{2mm} \text{ ft}^2\] \[12\hspace{2mm} \text{ ft}^2\] \[10 \frac{2}{3} \hspace{2mm} \text{ ft}^2\] \[8 \frac{1}{3}\hspace{2mm} \text{ ft}^2\] \[11\hspace{2mm} \text{ ft}^2\]

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