The formula for finding the surface area of a rectangular prism (such as a cushion) is:
Surface Area = 2lw + 2lh + 2wh
where l is the length, w is the width, and h is the height. To find the amount of fabric needed to cover the cushion, we need to calculate the surface area.
Surface Area = 2(13)(9) + 2(13)(3) + 2(9)(3)
Surface Area = 234 + 78 + 54
Surface Area = 366 square inches
Therefore, Greg will need 366 square inches of fabric to cover the cushion.
If the length of the cushion measures 13 in, the width measures 9 in, and the height measures 3 in, how much fabric does Greg need to cover the cushion?
1 answer
1 answer