Geometry 9-6 Dilations
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by Matthew Richardson
| 20 Questions
Note from the author:
A complete formative lesson with embedded slideshow, mini lecture screencasts, checks for understanding, practice items, mixed review, and reflection. I create these assignments to supplement each lesson of Pearson's Common Core Edition Algebra 1, Algebra 2, and Geometry courses. See also mathquest.net and twitter.com/mathquestEDU.
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10 pts
Solve It! The pupil is the opening in the iris that lets light into the eye. Depending on the amount of light available, the size of the pupil changes. Observe the size and shape of the iris in normal light and in dim light. What charcteristics stay the same and what charcteristics change?
  • Iris diameter
  • Pupil diameter
  • Remain the same
  • Change
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10 pts
Solve It! How do these observations compare to transformation of figures you learned about earlier in the chapter?
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Problem 1 Got It?
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Problem 2 Got It? Match the corrdinates of the vertices after the following transformation.

  • (-1, 0.5)
  • (0, -1)
  • (1, -0.5)
  • P'
  • Z'
  • G'
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10 pts
Problem 2 Got It? Reasoning: How are the pairs of segments from the item above related?

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Problem 3 Got It?
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Explain and correct the error(s).
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Explain and correct the error(s).
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Review Lesson 9-5:JKL has vertices J(23,2), K(4, 1), and L(1, 23). What are the coordinates of J', K', and L' after the translation?
Not all ordered pairs will be used.
  • (25, 1)
  • (-1, 3)
  • (3, -20)
  • (-25, 1)
  • (6, 2)
  • J'
  • K'
  • L'
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10 pts
Review Lesson 7-2: TRSU ~ NMYZ. Find the value of a. Enter only a number.
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10 pts
Review Lesson 7-2: TRSU ~ NMYZ. Find the value of b. Enter only a number.
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Review Lesson 7-2: TRSU ~ NMYZ. Find the value of c. Enter only a number.
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Vocabulary Review: Write the word isometry, congruence, or transformation to complete the sentence.

A mapping that results in a change in the position, size, or shape of a geometric figure is called a/an __?__.
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Use Your Vocabulary: Which of the pairs of items above shows a dilation?
The skateboards
The rings
The roller skates
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10 pts
Reflection: Math Success
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