Question

Find the total surface area of a cubical box of side '$a$' cm in which top surface is missing.

• A. $4a^2{\text{cm}}^2$
• B. $5a^2{\text{cm}}^2$
• C. $6a^2{\text{cm}}^2$
• D. $8a^2{\text{cm}}^2$

Answer 1

The correct option is B $5a^2{\text{cm}}^2$

Since, the top surface is missing in the cube.
Hence, the total surface area is the sum of the area of 5 surfaces = $5a^2{\text{cm}}^2$.