Question

Each of the cubes is $1$ m in length. The total surface area of the cuboid is

• A. $86m^2$
• B. $84m^2$
• C. $85m^2$
• D. $80m^2$

Answer 1

Answer: (A)

The left surface's area is $9m^2$
The front surface's area is $9m^2$
The top surface's area is $5\times 5=25m^2$
The right surface's area is $9m^2$
The back surface's area is $9m^2$
The bottom surface's area is $5\times 5=25m^2$
So, total surface's area is $9+9+25+9+9+25$ $=86m^2$