Find the volume of the composite figure, rounded to the nearest cubic foot: 2 ft 4 ft

Elementary Geometry For College Students, 7e
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ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
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### Finding the Volume of a Composite Figure

To determine the volume of the composite figure depicted, rounded to the nearest cubic foot, we need to break down the shape into simpler geometric forms, calculate the volume of each, and then sum these volumes.

The provided image shows a composite figure made up of a rectangular prism and two half-cylinders on either end. Below are the dimensions and steps to find the volume:

1. **Rectangular Prism**:
    - Length: 12 feet
    - Width: 4 feet
    - Height: 4 feet
   
   **Volume of the Rectangular Prism**:
   \[ V_{\text{prism}} = \text{length} \times \text{width} \times \text{height} \]
   \[ V_{\text{prism}} = 12 \, \text{ft} \times 4 \, \text{ft} \times 4 \, \text{ft} \]
   \[ V_{\text{prism}} = 192 \, \text{cubic feet} \]

2. **Cylinders** (two halves, combined as one full cylinder):
    - Radius: 2 feet (half of the width)
    - Height: 4 feet (same as the width of the prism)

   **Volume of One Cylinder**:
   \[ V_{\text{cylinder}} = \pi \times \text{radius}^2 \times \text{height} \]
   \[ V_{\text{cylinder}} = \pi \times (2 \, \text{ft})^2 \times 4 \, \text{ft} \]
   \[ V_{\text{cylinder}} = \pi \times 4 \, \text{ft}^2 \times 4 \, \text{ft} \]
   \[ V_{\text{cylinder}} = 16\pi \, \text{cubic feet} \]

   Since the composite figure includes two halves of this cylinder:
   \[ V_{\text{half-cylinders}} = 16\pi \, \text{cubic feet} \]

3. **Total Volume**:
   \[ V_{\text{total}} = V_{\text{prism}} + V_{\text{half-cylinders}} \]
   \[ V_{\text{total}}
Transcribed Image Text:### Finding the Volume of a Composite Figure To determine the volume of the composite figure depicted, rounded to the nearest cubic foot, we need to break down the shape into simpler geometric forms, calculate the volume of each, and then sum these volumes. The provided image shows a composite figure made up of a rectangular prism and two half-cylinders on either end. Below are the dimensions and steps to find the volume: 1. **Rectangular Prism**: - Length: 12 feet - Width: 4 feet - Height: 4 feet **Volume of the Rectangular Prism**: \[ V_{\text{prism}} = \text{length} \times \text{width} \times \text{height} \] \[ V_{\text{prism}} = 12 \, \text{ft} \times 4 \, \text{ft} \times 4 \, \text{ft} \] \[ V_{\text{prism}} = 192 \, \text{cubic feet} \] 2. **Cylinders** (two halves, combined as one full cylinder): - Radius: 2 feet (half of the width) - Height: 4 feet (same as the width of the prism) **Volume of One Cylinder**: \[ V_{\text{cylinder}} = \pi \times \text{radius}^2 \times \text{height} \] \[ V_{\text{cylinder}} = \pi \times (2 \, \text{ft})^2 \times 4 \, \text{ft} \] \[ V_{\text{cylinder}} = \pi \times 4 \, \text{ft}^2 \times 4 \, \text{ft} \] \[ V_{\text{cylinder}} = 16\pi \, \text{cubic feet} \] Since the composite figure includes two halves of this cylinder: \[ V_{\text{half-cylinders}} = 16\pi \, \text{cubic feet} \] 3. **Total Volume**: \[ V_{\text{total}} = V_{\text{prism}} + V_{\text{half-cylinders}} \] \[ V_{\text{total}}
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