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Big Ideas Math: Modeling Real Life, Grade 7

BI

Big Ideas Math: Modeling Real Life, Grade 7 View details

Chapter Review

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Exercise 1 Page 447

Remember the formula for the surface area of a prism.

158in.^2

Practice makes perfect

We want to calculate the surface area of the given prism.

To calculate the surface area of a rectangular prism, we can use the following formula. S=2l w+2l h+2wh The terms represent the area of the three possible different sized faces. Each term is multiplied by 2 because opposite faces on a rectangular prism have equal dimensions. We are given that l= 8, w= 3, and h= 5, so we have enough information to calculate the value of S.

S=2l w+2l h+2wh

SubstituteValues

Substitute values

S=2( 8)( 3)+2( 8)( 5)+2( 3)( 5)

Multiply

S=48+80+30

Add terms

S=158

The surface area is 158in.^2.

Subchapter links

1 Surface Areas of Prisms p.447

2 Surface Areas of Cyllinders p.447

3 Surface Areas of Pyramids p.448

4 Volumes of Prisms p.448

5 Volumes of Pyramids p.449

6 Cross Sections of Three-Dimensional Figures p.449