To determine how much area he will paint, you will find the areas of all six faces that are on his door.
Each face is in the shape of a rectangle, so use this formula.
The front and back, left and right side, top and bottom will be the same. This means you only need three different calculations.
80 x 36 = 2880 in.²
36 x 2 = 72 in.²
80 x 2 = 160 in.²
2880 in.² +72 in.² +160 in.² equals 3112 in.².
3112 in.² X 2 = 6224 in.²
The total area of the services he will paint is 6224 in.².
