McGraw Hill Integrated II, 2012
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McGraw Hill Integrated II, 2012 View details
4. Volumes of Prisms and Cylinders
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Exercise 29 Page 836

Use the formula for the volume of a prism.

120 cubic meters

Practice makes perfect

Let's analyze the given composite solid.

The composite solid consists of two smaller ones.
  • A rectangular prism with a length of l= 6 meters, a width of w= 4 meters, and a height of h= 4 meters.
  • A triangular prism with a base that is a right triangle with legs that are 2 and 6 meters, and a height of 4 meters.

First, lets find the volume of the rectangular prism. Its volume is equal to the product of its dimensions. Therefore, \textcolor{darkorange}{V_\text{rectangular}}={\color{#0000FF}{\ell}} {\color{#009600}{w}}{\color{#FF0000}{h}}=({\color{#0000FF}{6}})({\color{#009600}{4}})({\color{#FF0000}{4}})=\textcolor{darkorange}{96} cubic meters. Next, we will find the volume of the triangular prism.

The base of this prism is a right triangle with legs of 2 and 6 meters. Therefore, the area of the base is B= 12( 2)( 6)=6 square meters. Now, let's use the formula for the volume of a prism.
V_\text{triangular}=Bh
Substitute values and evaluate
V_\text{triangular}=({\color{#0000FF}{6}})({\color{#009600}{4}})
V_\text{triangular}=24
Therefore, the volume of the triangular prism is \textcolor{darkviolet}{V_\text{triangular}}=\textcolor{darkviolet}{24} cubic meters. Finally, let's find the volume of the composite solid.
V_\text{solid}=\textcolor{darkviolet}{V_\text{triangular}}+\textcolor{darkorange}{V_\text{rectangular}}
V_\text{solid}=\textcolor{darkviolet}{24}+\textcolor{darkorange}{96}
V_\text{solid}=120
The volume of the composite solid is 120 cubic meters.