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To find the length of \( BC \) in the given roof structure problem, we can analyze the 3D diagram provided.

### Given Information:
- \( AB = 3 \, \text{m} \)
- \( DC = EF = 2 \, \text{m} \)
- \( ED = FC = 2.4 \, \text{m} \)
- The width of the structure \( ED = 2.4 \, \text{m} \) and the vertical height from \( ED \) to \( A \) is \( 0.7 \, \text{m} \).

### Steps to Find \( BC \):

1. **Identify Triangle \( \triangle ABC \)**:
   - In the diagram, \( \triangle ABC \) is a right triangle, with \( AB \) as the horizontal leg, \( BC \) as the hypotenuse, and \( AC \) as the vertical leg.
   - From the side view (front view), \( A \) is directly above \( E \) at a height of \( 0.7 \, \text{m} \).

2. **Determine \( AC \)**:
   - \( AC \) can be found using the Pythagorean Theorem in triangle \( \triangle AEC \):
     \[
     AC = \sqrt{AE^2 + EC^2}
     \]
   - \( AE = 0.7 \, \text{m} \) (given vertical height)
   - \( EC = FC = 2.4 \, \text{m} \) (since \( E \) is directly below \( A \) on the horizontal plane)

3. **Calculate \( BC \)**:
   - Now use the Pythagorean theorem in \( \triangle ABC \):
     \[
     BC = \sqrt{AB^2 + AC^2}
     \]
   - Substituting the values \( AB = 3 \, \text{m} \) and \( AC \) calculated from the previous step.

### Let's Calculate:

1. **Calculate \( AC \)**:
   \[
   AC = \sqrt{(2.4)^2 + (0.7)^2} = \sqrt{5.76 + 0.49} = \sqrt{6.25} = 2.5 \, \text{m}
   \]

2. **Calculate \( BC \)**:
   \[
   BC = \sqrt{(3)^2 + (2.5)^2} = \sqrt{9 + 6.25} = \sqrt{15.25} \approx 3.91 \, \text{m}
   \]

### Final Answer:
The length of \( BC \) is approximately \( 3.91 \, \text{m} \).

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Would you like more details or have any questions? Here are some related questions to consider:

1. How would you calculate the length of \( DE \)?
2. What is the area of the triangular face \( ABC \)?
3. How can the total surface area of the roof structure be found?
4. What is the volume of the roof structure?
5. How does the symmetry of the structure help in simplifying calculations?
6. Can you find the length of \( EF \) in a similar manner?
7. What is the relationship between the angles in triangle \( ABC \)?
8. How would the length of \( BC \) change if \( AB \) were longer?

**Tip**: When working with 3D structures, always break the problem down into simpler 2D components or use symmetry to reduce the complexity.

Learn how to calculate the length of BC in a roof structure problem using the Pythagorean theorem. Given dimensions include AB = 3 m, DC = EF = 2 m, and ED = FC = 2.4 m. Understand the steps involved and the application of the Pythagorean theorem in this scenario. Suitable for Grades 9-12.

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