Geometry 9-2 Reflections

by Matthew Richardson

| 21 QuestionsNote 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.

1

1

10 pts

Solve It! Look at the shapes at the right. Visualize flipping each shape across its yellow line. What word do the images of the shapes form?

Use this link to access a Google Drawing for the Solve It! Use the Google Drawing to flip each shape across the the yellow segment. Doing so will create a word.

Screenshot your final product and upload it to the canvas.

2

2

10 pts

Problem 1 Got It?

A

B

C

D

3

10 pts

Problem 2 Got It?

1. Copy △ABC from Problem 2 to the coordinate plane on the canvas in black. Label A, B, and C.

2. Graph and label the following translation in blue or green.

4

5

6

5

5 pts

Problem 4 Got It? Can you use properties of reflections to prove that △GHJ is equliateral?

Yes

No

6

15 pts

Problem 4 Got It? Explain your response to the previous item.

7

7

10 pts

A

B

C

D

8

8

10 pts

A

B

C

D

9

10 pts

Graphing: Graph the following translation of △FGH.

Label F', G', and H'.

10

10 pts

Vocabulary: What is the relationship between a line of reflection and a segment joining corresponding points of the preimage and image?

11

12

11

10 pts

Error Analysis: A classmate sketched this diagram to represent the translation below.

Explain your classmate's error.

12

10 pts

Error Analysis: Show and label the correct location of A' on the canvas using blue or green.

13

10 pts

Vocabulary: Use reflection notation to indicate the reflection of P(x, y) across the y-axis and the coordinates of the post-reflection imageP'.

14

10 pts

Review Lesson 9-1: Consider the translation of point T.

Write a rule to describe the translation represented by the ordered pairs.

15

10 pts

Review Lesson 7-2: A map of Alberta, Canada uses the scale 1 cm = 25 km. On the map, the distance from Calgary to Edmonton is 11.1 cm. How many kilometers apart are the two cities? Enter only a number, rounded to the nearest kilometer.

16

10 pts

Preview Lesson 9-3: Draw the angles on the protractors using the indicated colors.

17

10 pts

Vocabulary Review: △ABC is congruent to △RST and △ABC ≅ △RST. Match corresponding parts of the triangles below.

- ∠A
- ∠T
- ∠B
- segment AB
- segment ST
- segment TR

- ∠R
- ∠C
- ∠S
- segment CA
- segment BC
- segment RS

18

19

18

10 pts

Use Your Vocabulary: Tell whether the pair of figures shows a reflection.

Yes

No

19

10 pts

Use Your Vocabulary: Tell whether the pair of figures shows a reflection.

Yes

No

20

10 pts

Use Your Vocabulary: Reflect △ABC over the line segment. Draw and label its reflection, △A'B'C', in blue or green.

21

10 pts

Reflection: Math Success

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