Math Problem Statement

Using Similar Triangles: Find the lengths of BC and AC.

Solution

The image shows a geometry problem involving two triangles, one inscribed within the other, and asks to find the lengths of segments BCBC and ACAC using similar triangles.

We are given the following information from the image:

  • The right-angled triangle ABCABC and another triangle AXYAXY.
  • Segment AB=5cmAB = 5 \, \text{cm}, segment BX=8cmBX = 8 \, \text{cm}, segment AX=6cmAX = 6 \, \text{cm}, and segment XY=10cmXY = 10 \, \text{cm}.

We will use the concept of similar triangles. The triangles ABCABC and AXYAXY appear to be similar because they share an angle (at AA) and both have right angles, implying angle-angle similarity.

Step 1: Set up the ratio of corresponding sides

For similar triangles, the ratios of corresponding sides are equal. So, we have:

ABAX=BCXY\frac{AB}{AX} = \frac{BC}{XY}

Substitute the given values:

56=BC10\frac{5}{6} = \frac{BC}{10}

Step 2: Solve for BCBC

We now solve for BCBC by cross-multiplying:

BC=56×10=506=8.33cmBC = \frac{5}{6} \times 10 = \frac{50}{6} = 8.33 \, \text{cm}

Step 3: Solve for ACAC

Similarly, the ratio for the hypotenuses of the triangles is:

ACAY=ABAX\frac{AC}{AY} = \frac{AB}{AX}

Since AY=XYAY = XY (they are the same length):

AC10=56\frac{AC}{10} = \frac{5}{6}

Solving for ACAC:

AC=56×10=8.33cmAC = \frac{5}{6} \times 10 = 8.33 \, \text{cm}

Conclusion:

  • The length of BCBC is approximately 8.33cm8.33 \, \text{cm}.
  • The length of ACAC is also approximately 8.33cm8.33 \, \text{cm}.

Would you like further details or a different explanation for this solution?


Here are 5 questions to extend this problem:

  1. How can we verify that the triangles are similar using the properties of angles?
  2. What would happen if the ratio between two corresponding sides was different?
  3. How can the Pythagorean theorem be used to verify the length of BCBC?
  4. Can you calculate the area of both triangles?
  5. What other methods could be used to find the unknown sides in similar triangles?

Tip: Always verify the similarity of triangles before applying the ratio of corresponding sides. This ensures the method is correct.

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Math Problem Analysis

Mathematical Concepts

Similar Triangles
Ratio and Proportions
Geometry

Formulas

For similar triangles: (Corresponding sides ratios) \( \frac{AB}{AX} = \frac{BC}{XY} \)
Proportions to find unknown side lengths

Theorems

Angle-Angle (AA) Similarity Theorem

Suitable Grade Level

Grades 8-10