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6-8 Accelerated 7 Unit 2 Lesson 9

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K-5 Math •6-8 Math 9-12 Math

Course

Accelerated 6 •Accelerated 7

Unit

Unit 1 •Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Unit 7 Unit 8 Unit 9

Lesson

Lesson 1 Lesson 2 Lesson 3 Lesson 4 Lesson 5 Lesson 6 Lesson 7 Lesson 8 •Lesson 9 Lesson 10 Lesson 11 Lesson 12 Lesson 13 Lesson 14 Lesson 15 Lesson 16 Lesson 17 Lesson 18 Lesson 19

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Accelerated 6
Accelerated 7

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Unit 2
Unit 3
Unit 4
Unit 5
Unit 6
Unit 7
Unit 8
Unit 9

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Lesson 2
Lesson 3
Lesson 4
Lesson 5
Lesson 6
Lesson 7
Lesson 8
Lesson 9
Lesson 10
Lesson 11
Lesson 12
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Unit 2, Lesson 9

Dilations

Accelerated 7

Practice

Problem 1
Student Task Statement
Here is triangle .

Dilate each vertex of triangle using as the center of dilation and a scale factor of 2. Draw the triangle connecting the 3 new points.

Dilate each vertex of triangle using as the center of dilation and a scale factor of . Draw the triangle connecting the 3 new points.

Measure the longest side of each of the 3 triangles. What do you notice?

Measure the angles of each triangle. What do you notice?

Lesson 9 Resources

Student Materials Student Materials in Spanish

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Problem 2

Student Task Statement

Segment measures 3 cm. Point is the center of dilation. How long is the image of after a dilation with:

Scale factor 5?
Scale factor 3.7?
Scale factor ?
Scale factor ?

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Problem 3

Student Task Statement

Here are points and . Plot the points for each dilation described.

Points A and B

is the image of using as the center of dilation and a scale factor of 2.
is the image of using as the center of dilation and a scale factor of 2.
is the image of using as the center of dilation and a scale factor of .
is the image of using as the center of dilation and a scale factor of .

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Problem 4

Student Task Statement

Make a perspective drawing. Include in your work the center of dilation, the shape you dilate, and the scale factor you use.

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Problem 5

ForLesson 8: Projecting and Scaling

Student Task Statement

Triangle and triangle are scaled copies. Side measures 12 cm and is the longest side of . Side measures 8 cm and is the longest side of .

Triangle is a scaled copy of triangle with what scale factor?
Triangle is a scaled copy of triangle with what scale factor?

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