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IM Geo.3.8 Practice: Are They All Similar?

This is an invalid proof that all isosceles triangles are similar.

  1. Draw 2 isosceles triangles  and  where  and .
  2. Dilate triangle  to a new triangle  using center  and scale factor  so that .
  3. Translate by directed line segment  to take  to a new triangle . Since translation preserves distance,  and .
  4. Since , we can rotate using center  to take  to .
  5. Since , we can rotate using center  to take  to .
  6. We have now established a sequence of dilations, translations, and rotations that takes  to  to , and  to , so the triangles are similar.
Explain which step is invalid and why.

Which statement provides a valid justification for why all circles are similar?

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Which pair of polygons is similar?

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Select all sequences of transformations that would show that triangles  and  are similar. The length of  is  units.

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Determine if each statement must be true, could possibly be true, or definitely can't be true. Explain or show your reasoning.

Two equilateral triangles are similar.

An equilateral triangle and a square are similar.

Find a sequence of rigid transformations and dilations that takes square to square .

Select all true statements given that angle  is congruent to angle . 

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