There are many different formulas for the many types of shapes. These shapes can be found in everyday life. Have you ever needed to paint a room and needed to calculate how much paint you needed for the walls? Before you buy the paint, you need to know the surface area.
Lets say that you had a bedroom with an area of 9 feet by 10 feet and the ceiling is 12 feet from the floor. You only need to paint the walls. What is the surface area of the room?
There are two walls that are 9 ft by 12 ft, and there are 2 walls that are 10 ft by 12 ft. Using this information, the formula would be:
2(9 x 12) + 2(10 x 12)
=2(108)+2(120)
=216+240
=360 square feet
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