Math Problem Statement

The given image contains two parallel lines, \( \overline{HI} \parallel \overline{GJ} \), and we are asked to find the length of \( FJ \), a segment in the figure. The diagram shows the following distances: \( HG = 24 \), \( FG = 54 \), \( IJ = 90 \).

Solution

The given image contains two parallel lines, HIGJ\overline{HI} \parallel \overline{GJ}, and we are asked to find the length of FJFJ, a segment in the figure. The diagram shows the following distances:

  • HG=24HG = 24
  • FG=54FG = 54
  • IJ=90IJ = 90

Since HIGJ\overline{HI} \parallel \overline{GJ}, the triangles HGI\triangle HGI and GFJ\triangle GFJ are similar by AA (Angle-Angle) similarity, because corresponding angles formed by the parallel lines are equal.

Using the property of similar triangles:

We can write the proportion based on the similarity of the triangles: HGFG=HIGJ=IJFJ\frac{HG}{FG} = \frac{HI}{GJ} = \frac{IJ}{FJ}

Substitute the known values into this proportion: 2454=90FJ\frac{24}{54} = \frac{90}{FJ}

Solving for FJFJ:

First, simplify the fraction: 2454=49\frac{24}{54} = \frac{4}{9}

Now set up the equation: 49=90FJ\frac{4}{9} = \frac{90}{FJ}

Cross-multiply: 4FJ=9904 \cdot FJ = 9 \cdot 90 4FJ=8104 \cdot FJ = 810

Now divide by 4: FJ=8104=202.5FJ = \frac{810}{4} = 202.5

Thus, the length of FJFJ is 202.5.

Would you like a more detailed explanation or help with another question?

Here are some related questions you could explore:

  1. How do you determine the similarity of two triangles geometrically?
  2. What are other ways to prove that two lines are parallel in a geometric figure?
  3. How does the concept of similar triangles apply to real-world scenarios?
  4. Can you solve for unknown sides in a triangle using trigonometric ratios instead of similarity?
  5. What happens if the lines in the figure are not parallel? How would that change the solution?

Tip: When working with similar triangles, always remember to set up the proportion correctly and check if the corresponding angles are equal.

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Math Problem Analysis

Mathematical Concepts

Geometry
Similar Triangles
Proportions

Formulas

Proportions in similar triangles
\( \frac{HG}{FG} = \frac{IJ}{FJ} \)

Theorems

Angle-Angle (AA) Similarity Theorem

Suitable Grade Level

Grades 7-9