Practice!

Sample Problem

Each of the cubes is 1 inch in length. The total surface area of the solid is inch2.

Solution

The left surface’s area is 6 inch2

The front surface’s area is 10 inch2

The top surface’s area is 3 × 4 = 12 inch2

The right surface’s area is 6 inch2

The back surface’s area is 10 inch2

The bottom surface’s area is 3 × 4 = 12 inch2

So, the total surface’s area is 6 + 10 + 12 + 6 + 10 + 12 = 56 inch2