Similar Triangles Analysis: Comparing Triangles with Sides (6,8,9) and (5,8,9)

Similar Triangles with Proportional Sides

Are the triangles below similar?

666999888555999888AAABBBCCCDDDEEEFFF

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Are the triangles similar?
00:03 We want to find the similarity ratio
00:07 This is the ratio of sides
00:10 If all side ratios are equal, then the triangles are similar
00:13 This pair of sides ratio is equal
00:17 This pair of sides ratio is not equal
00:24 The similarity ratio is not equal, therefore the triangles are not similar
00:28 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Are the triangles below similar?

666999888555999888AAABBBCCCDDDEEEFFF

2

Step-by-step solution

The sides of the triangles are not equal and, therefore, the triangles are not similar.

3

Final Answer

No

Key Points to Remember

Essential concepts to master this topic
  • Rule: Triangles are similar when corresponding sides are proportional
  • Technique: Compare ratios: 65=1.2 \frac{6}{5} = 1.2 , 88=1 \frac{8}{8} = 1 , 99=1 \frac{9}{9} = 1
  • Check: All ratios equal means similar; different ratios means not similar ✓

Common Mistakes

Avoid these frequent errors
  • Assuming triangles with some equal sides are similar
    Don't just look for matching side lengths and assume similarity! Even if triangles share some equal sides (like both having 8 and 9), they're only similar if ALL corresponding sides are proportional. Always check that every side ratio equals the same value.

Practice Quiz

Test your knowledge with interactive questions

Angle B is equal to 60°

Angle C is equal to 55°

Angle E is equal to 60°

Angle F is equal to 50°

Are these triangles similar?

AAABBBCCCDDDEEEFFF

FAQ

Everything you need to know about this question

Why aren't these triangles similar if they both have sides 8 and 9?

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Having some matching sides isn't enough! For similarity, we need all corresponding sides to be proportional. Here, ratios are 65=1.2 \frac{6}{5} = 1.2 , 88=1 \frac{8}{8} = 1 , and 99=1 \frac{9}{9} = 1 - they're different!

How do I know which sides correspond to each other?

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Start by arranging the sides in order from smallest to largest. Triangle 1: (6, 8, 9) and Triangle 2: (5, 8, 9). Then compare: smallest to smallest, middle to middle, largest to largest.

What if I get different ratios like this problem?

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If even one ratio is different from the others, the triangles are not similar. All ratios must be exactly equal for similarity to exist.

Do the triangles need to look the same to be similar?

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No! Similar triangles can be different sizes and even flipped or rotated. What matters is that all corresponding angles are equal and all corresponding sides are proportional.

Can I just check if two ratios are equal instead of all three?

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No, you must check all three ratios! It's possible for two ratios to match while the third one doesn't, which means the triangles aren't similar.

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