To find the total surface area of the box, we calculate the surface area of each side:
- Two of the sides measure 10 inches by 7 inches, so their combined area is 10*7*2 = 140 square inches
- Two of the sides measure 9 inches by 7 inches, so their combined area is 9*7*2 = 126 square inches
- Two of the sides measure 10 inches by 9 inches, so their combined area is 10*9*2 = 180 square inches
The total surface area of the box is 140 + 126 + 180 = 446 square inches.
If Cheese purchases 500 square inches of cardboard but the box only requires 446 square inches, there will be 500 - 446 = 54 square inches left over.
Cheese needs to buy some cardboard to build a box 10 inches long, 9 inches wide, and 7 inches high if she purchases 500 square inches of cardboard how much will be left over
1 answer