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# 8.3 Proving Triangle Similarity by Sss and Sas Answer Key

In the captivating realm of geometry, proving triangle similarity stands as a powerful technique for unveiling hidden relationships between triangles. In this comprehensive guide, we delve into the methods of proving similarity using Side-Side-Side (SSS) and Side-Angle-Side (SAS) criteria. To reinforce your understanding, we present a carefully curated set of practice problems along with detailed answer explanations.

### Exploring Triangle Similarity by SSS and SAS

Triangle similarity is a fascinating concept that allows us to establish proportional relationships between corresponding sides of triangles.

### Method 1: Proving Similarity by Side-Side-Side (SSS) Criterion

In the SSS method, if the corresponding sides of two triangles are proportional, the triangles are considered similar.

### Method 2: Proving Similarity by Side-Angle-Side (SAS) Criterion

The SAS method involves proving similarity by demonstrating that two pairs of corresponding sides are proportional and the included angle between these sides is congruent.

### Solving Practice Problems Using SSS and SAS Criteria

Let’s apply our knowledge to practice problems:

1. Given two triangles with side lengths AB = 6, BC = 8, and AC = 10, and DE = 9, EF = 12, and DF = 15, prove their similarity using the SSS criterion.
Answer: By calculating the ratios AB/DE, BC/EF, and AC/DF, we find that the triangles are similar by the SSS criterion.
2. In two triangles, angle A is congruent to angle D, and sides AB/DE and BC/EF are proportional. Prove the triangles are similar using the SAS criterion.
Answer: Since the angles are congruent and the sides are proportional, the triangles are similar by the SAS criterion.
3. Given triangles ABC and DEF, if ∠A = ∠D, ∠B = ∠E, and BC/EF = 2/3, prove the triangles are similar using the SAS criterion.
Answer: The given conditions satisfy the SAS criterion, establishing the similarity of the triangles.

### Mastering Triangle Similarity: Unveiling Geometric Proportions

As you delve into the methods of proving triangle similarity, you gain the ability to establish proportionality between corresponding sides and angles. This skill extends beyond geometry, finding applications in fields such as engineering and physics.

In conclusion, proving triangle similarity by SSS and SAS criteria unveils the hidden geometric relationships between triangles. By mastering these methods and solving practice problems, you equip yourself to confidently establish similarity and apply it to a variety of geometric scenarios. Armed with the practice problems and answers provided in this guide, you’re well-prepared to navigate the intricacies of triangle similarity with confidence.

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