09-7.7B

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GRADE 7 MATHEMATICS (7.7) Geometry and spatial reasoning. The student uses coordinate geometry to describe location on a plane. (B) graph reflections across the horizontal or vertical axis and graph translations on a coordinate plane.

The student is expected to:

ΔABC is graphed below and is to be translated.

  If A is translated to A' (–2, 1) what would be the coordinates of B' and C'? B' (

,

)

C' (

,

)

  Describe the translation in words. y 9 8 7

C

6 5 4 3

A

2 1

-9 -8

-7 -6 -5 -4 -3

-2

-1

. 0

1

2

3

4

5

6

7

8

9

x

-1 -2 -3

B

-4 -5 -6 -7 -8 -9

1. What mathematical concepts and vocabulary do I need to know to be able to work this problem?

2. Will the Grade 7 Mathematics Formula Chart be helpful on this problem? Why or why not?

3. Will a picture or diagram be helpful on this problem? If so, how?

4. What problem-solving strategy or strategies will I use to help solve this problem?

5. Extension (7.7B): If ABC is to be translated so that it is contained entirely in Quadrant I, what is the least movement that will accomplish this task? TEKSING TOWARD TAKS © 2006

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