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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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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