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Answered

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1. Cecilia needs to buy some cardboard to build a box 12 inches long,
8 inches wide, and 10 inches high. How much cardboard is needed
to build the box?
What is asked in the problem?_____________________________________________
What are the given facts?_________________________________________________
What is the formula you need to use to solve the problem?
Solve:

Sagot :

Misspancitcantonidn
  • How much cardboard is needed to build the box?

  • A box that is 12 inches long, 8 inches wide, and 10 inches high.

  • Surface Area = 2wl + 2lh + 2hw

  • SA= 2(8 in)(12 in) + 2(12 in)(10 in) + 2(10 in)(8 in)

= 192 in² + 140 in² + 160 in²

= 492 in²

Surface Area Of A Rectangular Prism

The surface area refers to the total area of the surface of a three-dimensional object. To find the surface area of the box, you have to find the sum of the areas of all the faces. Since the box is in rectangular prism shape, the formula to use is the one below:

Surface Area = 2wl + 2lh + 2hw

Where: w is the width.

l is the length.

h is the height.

Just plug in their values in the formula and solve. Remember that your answer should be in unit squared. Therefore, the cardboard needed to build the box is 492 inches².

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