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Similarity Transformations

Answer Keys Here

Aligned To Common Core Standard:

Trigonometry - HSG-SRT.A.2

What are the Similarity Transformations? Transformation in mathematics is a fun concept as it allows moving an object from its original position and orientation to a new position and orientation. There are three types of transformations that we can perform on geometrical shapes, including reflection, rotation, and translation. We know what transformations are, but do we know what similarity transformations are? A similarity transformation is a case when the resulting image after applying one or more rigid transformations is similar to the original figure. A rigid transformation is applied to the figure and a dilation then follows it. The resulting image has the same angles and all the sides of the original figure and the image are proportional. A similarity transformation is given by; A'≡BAB-1 Similarity transformations and self-similarity are crucial when learning the concepts of iterated function systems and fractals. These worksheets and lessons help students learn how to recognize and perform similarity transformation which are standard transformations that are followed by a dilation.

Printable Worksheets And Lessons

Homework Sheets

This skill is somewhat the inverse of the previous standard. It just requires you to think at a slightly higher level.

  • Homework 1 - After translating the center of F to the center of F', dilate F about its new center to contract F onto F'.
  • Homework 2 - Choose a pair of corresponding vertices not located at the origin, like V' (2, -2) and the image of V after the translation, which is V' (10,-10).
  • Homework 3 - To find the scale factor of this dilation, calculate the ratio of the radii.

Practice Worksheets

If students are having trouble start with the second version here.

  • Practice 1 - You can transform triangle PQR to triangle P'Q'R' by translating it and then performing dilation centered at the origin. So, triangle PQR ~ triangle P'Q'R'. Find the translation rule and the scale factor of the dilation.
  • Practice 2 - You can transform S to S' by translating it and then performing a dilation. Find the translation rule and the scale factor of the dilation.
  • Practice 3 - See if you can model what is asked for.

Math Skill Quizzes

I mix some fun questions with problems that require a little bit of thinking.

  • Quiz 1 - Determine if it is an example of translation?
  • Quiz 2 - Under a translation of 2 units up and 4 units to the left, the point (6, 6) will become (-10,-3). Is this translation is true or false?
  • Quiz 3 - If the length of the plastic cover is 16 inches under the scale factor of the dilation is 4. What is the width of the plastic cover after the dilation?