Unit 2 - Lesson 4 - Grade 8: Illustrative Mathematics

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Grade 8 Unit 2
Lesson 4: Dilations on a Square Grid
CC BY 2021 Illustrative Mathematics®
Grade 8 Unit 2
Lesson 4: Dilations on a Square Grid
CC BY 2021 Illustrative Mathematics®
Lesson: Dilations on a Square Grid

Estimating a Scale Factor (Warm Up)

1.

Point C is the dilation of point B with center of dilation A and scale factor s. Estimate s. Be prepared to explain your reasoning.

Dilations on a Grid

2.

Find the dilation of quadrilateral ABCD with center P and scale factor 2.

3.

Find the dilation of triangle QRS with center T and scale factor 2.

4.

Find the dilation of triangle QRS with center T and scale factor 1/2.

Card Sort: Matching Dilations on a Coordinate Grid

  • Your teacher will give you some cards. Each of Cards 1 through 6 shows a figure in the coordinate plane and describes a dilation.
  • Each of Cards A through E describes the image of the dilation for one of the numbered cards.
  • Match number cards with letter cards. One of the number cards will not have a match. For this card, you’ll need to draw an image.
5.

Draw your image for the card that does not have a match.

Cool Down: A Dilated Image

A Dilated Image

6.

Draw the image of rectangle ABCD under dilation using center P and scale factor 1/2.