The object has 4 cubes. Each cube has 6 faces. So the number of faces is: 6 x 4 = 24
There are 3 places where the faces overlap so subtract 3 x 2, or 6 faces.
The surface area in square units is 24 - 6 = 18
Q: Why are we multiplying 3 by 2? I understand the 3 faces you need to remove, but why multiply it by 2?
There are 3 places where the faces overlap so subtract 3 x 2, or 6 faces.
The surface area in square units is 24 - 6 = 18
Q: Why are we multiplying 3 by 2? I understand the 3 faces you need to remove, but why multiply it by 2?