64 64° 77° 49 H. D. 39 K 39 77° E 49° 'F Which pair of triangles is similar? O ABCA ~ AEDF O ADFE ~ AKML O AMKL ~ AHGJ 2. O AACB ~ AGHJ

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
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**Which pair of triangles is similar?**

There are four triangles labeled with their corresponding angles. Here are the details of each triangle:

1. Triangle BCA:
   - \( \angle B = 64^\circ \)
   - \( \angle C = 77^\circ \)

2. Triangle EDf:
   - \( \angle D = 39^\circ \)
   - \( \angle E = 77^\circ \)

3. Triangle KLM:
   - \( \angle K = 39^\circ \)
   - \( \angle L = 64^\circ \)
   - \( \angle M = 49^\circ \)

4. Triangle GHJ:
   - \( \angle H = 49^\circ \)
   - \( \angle J = 64^\circ \)

The question asks which pair of triangles is similar.

**Answer choices:**

- ○ \( \triangle BCA \sim \triangle EDF \)
- ○ \( \triangle DFE \sim \triangle KML \)
- ○ \( \triangle MKL \sim \triangle HGJ \)
- ○ \( \triangle ACB \sim \triangle GHJ \)

**Explanation of the diagrams:**

1. **Triangle BCA** has angles of 64° and 77°. The third angle, which can be determined by subtracting the sum of the known angles from 180°, is 39°.

2. **Triangle EDF** has angles of 39° and 77°. The third angle, which can be determined similarly, is 64°.

3. **Triangle KML** has angles of 39°, 49°, and 64°.

4. **Triangle GHJ** has angles of 49° and 64°. The third angle, which can be determined similarly, is 67°.

Using the angle-angle (AA) similarity criterion, we compare the triangles based on their angles:

- Comparing \(\triangle BCA\) and \(\triangle EDF\), both have angles of 39°, 64°, and 77°, indicating similarity.

Therefore, the correct answer is:

- ○ \( \triangle BCA \sim \triangle EDF \)
Transcribed Image Text:**Which pair of triangles is similar?** There are four triangles labeled with their corresponding angles. Here are the details of each triangle: 1. Triangle BCA: - \( \angle B = 64^\circ \) - \( \angle C = 77^\circ \) 2. Triangle EDf: - \( \angle D = 39^\circ \) - \( \angle E = 77^\circ \) 3. Triangle KLM: - \( \angle K = 39^\circ \) - \( \angle L = 64^\circ \) - \( \angle M = 49^\circ \) 4. Triangle GHJ: - \( \angle H = 49^\circ \) - \( \angle J = 64^\circ \) The question asks which pair of triangles is similar. **Answer choices:** - ○ \( \triangle BCA \sim \triangle EDF \) - ○ \( \triangle DFE \sim \triangle KML \) - ○ \( \triangle MKL \sim \triangle HGJ \) - ○ \( \triangle ACB \sim \triangle GHJ \) **Explanation of the diagrams:** 1. **Triangle BCA** has angles of 64° and 77°. The third angle, which can be determined by subtracting the sum of the known angles from 180°, is 39°. 2. **Triangle EDF** has angles of 39° and 77°. The third angle, which can be determined similarly, is 64°. 3. **Triangle KML** has angles of 39°, 49°, and 64°. 4. **Triangle GHJ** has angles of 49° and 64°. The third angle, which can be determined similarly, is 67°. Using the angle-angle (AA) similarity criterion, we compare the triangles based on their angles: - Comparing \(\triangle BCA\) and \(\triangle EDF\), both have angles of 39°, 64°, and 77°, indicating similarity. Therefore, the correct answer is: - ○ \( \triangle BCA \sim \triangle EDF \)
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