8. 4 7

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
Problem 1CT
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### Finding the Surface Area of Each Prism

For each of the following prism diagrams, calculate the surface area and round to the nearest tenth if necessary.

#### Diagram 5:
A rectangular prism with dimensions:
- Length: 18 units
- Width: 6 units
- Height: 8 units

#### Diagram 6:
A rectangular prism with dimensions:
- Length: 15 units
- Width: 13 units
- Height: 7 units

#### Diagram 7:
A triangular prism with dimensions:
- Height of the triangle: 6 units
- Base of the triangle: 9 units
- Hypotenuse of the triangle: 10 units

#### Diagram 8:
A triangular prism with dimensions:
- Height of the triangle: 4 units
- Base of the triangle: 3 units
- Hypotenuse of the triangle: 5 units (not provided but derived from a right triangle with sides 3 and 4)
- Length of the prism: 7 units

### Explanation:

1. **Rectangular Prism Surface Area Calculation**:
   The surface area \(A\) of a rectangular prism can be calculated with the formula:
   \[
   A = 2lw + 2lh + 2wh
   \]
    where \(l\) is the length, \(w\) is the width, and \(h\) is the height.
   
   - For Diagram 5:
     \[
     A = 2(18 \times 6) + 2(18 \times 8) + 2(6 \times 8)
     \]
   - For Diagram 6:
     \[
     A = 2(15 \times 13) + 2(15 \times 7) + 2(13 \times 7)
     \]

2. **Triangular Prism Surface Area Calculation**:
   The surface area \(A\) of a triangular prism can be calculated with the formula:
   \[
   A = bh + lw + lh + wh + lw
   \]
    where \(b\) is the base of the triangle, \(h\) is the height of the triangle, and \(l\) is the length of the prism.
   
   - For Diagram 7:
     \[
     \text{Base Area} = \frac{1}{2} \times 6 \times 9
     \
Transcribed Image Text:### Finding the Surface Area of Each Prism For each of the following prism diagrams, calculate the surface area and round to the nearest tenth if necessary. #### Diagram 5: A rectangular prism with dimensions: - Length: 18 units - Width: 6 units - Height: 8 units #### Diagram 6: A rectangular prism with dimensions: - Length: 15 units - Width: 13 units - Height: 7 units #### Diagram 7: A triangular prism with dimensions: - Height of the triangle: 6 units - Base of the triangle: 9 units - Hypotenuse of the triangle: 10 units #### Diagram 8: A triangular prism with dimensions: - Height of the triangle: 4 units - Base of the triangle: 3 units - Hypotenuse of the triangle: 5 units (not provided but derived from a right triangle with sides 3 and 4) - Length of the prism: 7 units ### Explanation: 1. **Rectangular Prism Surface Area Calculation**: The surface area \(A\) of a rectangular prism can be calculated with the formula: \[ A = 2lw + 2lh + 2wh \] where \(l\) is the length, \(w\) is the width, and \(h\) is the height. - For Diagram 5: \[ A = 2(18 \times 6) + 2(18 \times 8) + 2(6 \times 8) \] - For Diagram 6: \[ A = 2(15 \times 13) + 2(15 \times 7) + 2(13 \times 7) \] 2. **Triangular Prism Surface Area Calculation**: The surface area \(A\) of a triangular prism can be calculated with the formula: \[ A = bh + lw + lh + wh + lw \] where \(b\) is the base of the triangle, \(h\) is the height of the triangle, and \(l\) is the length of the prism. - For Diagram 7: \[ \text{Base Area} = \frac{1}{2} \times 6 \times 9 \
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