Unit 1 - Lesson 10 - Grade 8: Illustrative Mathematics

What can you say about the measures of angles B and C?

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What kind of quadrilateral is ABCD?Explain how you know.

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Describe a rigid transformation that takes Triangle 1 to Triangle 2. What points in Triangle 2 correspond to points A, B, and C in the original triangle?

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Describe a rigid transformation that takes Triangle 1 to Triangle 3. What points in Triangle 3 correspond to points A, B, and C in the original triangle?

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Find two pairs of line segments in the diagram that are the same length, and explain how you know they are the same length.

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Find two pairs of angles in the diagram that have the same measure, and explain how you know they have the same measure.

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How long is... How do you know?

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If you continue to reflect each new triangle this way to make a pattern, what will the pattern look like?

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