Do Now! Have out your IMN, calculator and a pencil. TOC: pg. - - PDF document

Week 3 08.14.17 Day 4 Dilations.notebook 1 August 17, 2017

Aug 12­9:14 AM

Do Now!

• Have out your IMN, calculator and a pencil.
• TOC: pg. 13,Dilations and Scale Factor

Mar 3­2:14 PM

Learning Target: I can dilate geometric figures on the coordinate plane. Standards: MGSE8G3 Describe the effect of dilations, translations, rotations, and reflections on two-dimensional figures using coordinates. MGSE8G4 Understand that a two-dimensional figure is similar to another if the second can be obtained from the first by a sequence of rotations, reflections, translations, and dilations; given two similar two-dimensional figures, describe a sequence that exhibits the similarity between them.

Week 3 08.14.17 Day 4 Dilations.notebook 2 August 17, 2017

Mar 5­6:24 PM Dilation and Scale Factor dilation: changes the size of a figure, but not its shape. It may be an enlargement or a reduction. Creates a similar figure. scale factor: the ratio of corresponding sides on similar figures.

• p. 13

scale factor = image

• riginal

Pre-image (original) 2 2 3 Image 6 9 6 Scale factor > 1 to dilate multiply by 3

scale factor = = = 3 = 3 image

• riginal

6 2 9 3

Enlargement Reduction

Pre-image (original) 15 15 10 Image 3 2 3 Scale factor < 1 to dilate multiply by 1/5

scale factor = = = = image

• riginal

3 15 2 10 1 5 1 5 Aug 13­9:53 AM

Work Time

• 1. Complete EDpuzzle assignment, "Lesson 3.1 Dilations
• f Triangles"
• 2. Complete "Dilations/Translations Worksheet" #1-8
• 3. Complete "Dilations and Scale Factor Lesson 21"

Practice #1-10

• 4. Correct all missed problems on your Transformations

Test! All Re-Takes must be completed by Friday, August 25.

• 5. EDpuzzle assignment"Lesson 3.2 Similar Figures",

take notes, and complete assessment.

Week 3 08.14.17 Day 4 Dilations.notebook 3 August 17, 2017

Aug 21­7:26 PM Aug 21­7:31 PM

Week 3 08.14.17 Day 4 Dilations.notebook 4 August 17, 2017

Aug 21­7:49 PM

Closing Talk the Talk p. 94-95 In this lesson, several triangles were dilated. Whether it was an enlargement or a reduction, the same conclusions can be drawn about the relationship between corresponding angles and the relationship between the corresponding sides of a triangle and its image resulting from dilation.

• 1. Describe the relationship between the corresponding

angles in an original triangle and its image resulting from dilation.

• 2. Describe the relationship between the corresponding

sides in an original figure and its image resulting from dilation.

• 3. Does dilation result in an image that is the same shape as

the original? Why or why not?

• 4. Does dilation result in an image that is the same size as

the original? Why or why not?

• 5. If two triangles are congruent, what is the relationship

between the corresponding angles?

• 6. If two triangles are congruent, what is the relationship

between the corresponding sides?

• 7. Describe how a triangle is dilated when the ratio distance
• f the image from the center of dilation : distance of the
• riginal figure from the center of dilation is:
• less than 1.
• equal to 1.
• greater than 1.

Mar 9­10:29 PM

Ticket Out the Door Use the coordinates in the situation to determine the scale factor used.

• 1. A(-2, -1)

B(-2, -2) C(1, 1) A'(-8, -4) B'(-8, -8) C'(4, 4)

Week 3 08.14.17 Day 4 Dilations.notebook 5 August 17, 2017

Sep 1­9:40 PM

Homework:

• Watch video "Lesson 3.2 Similar Figures", take notes,

and complete assessment.

• Test Corrections for Congruency and Transformation

Test

• "Dilations and Scale Factor Lesson 21" Practice #1-10
• "Dilations/Translations Worksheet" #1-8

Aug 26­11:35 AM