Five-Minute Check (over Lesson 9–1)

Then/Now

New Vocabulary

Key Concept: Translation

Example 1: Draw a Translation

Key Concept: Translation in the Coordinate Plane

Example 2: Translations in the Coordinate Plane

Example 3: Real-World Example: Describing Translations

Over Lesson 9–1

Name the reflected image of BC in line m.

___

A.

B.

C.

D.

Over Lesson 9–1

Name the reflected image of AB in line m.

___

A.

B.

C.

D.

Over Lesson 9–1

A. ΔFGE

B. ΔEGD

C. ΔCGD

D. ΔBCG

Name the reflected image of ΔAGB in line m.

Over Lesson 9–1

A. D

B. E

C. F

D. G

Name the reflected image of B in line m.

Over Lesson 9–1

A. AFEB

B. DCBE

C. EDCF

D. FEDA

Name the reflected image of ABCF in line m.

Over Lesson 9–1

Which of the following shows a reflection in the x-axis?

A. B.

C. D.

You found the magnitude and direction of vectors. (Lesson 8–7)

• Draw translations.

• Draw translations in the coordinate plane.

• translation vector

Draw a Translation

Copy the figure and given translation vector. Then draw the translation of the figure along the translation vector.

Step 2 Measure the length ofvector . Locate point G'by marking off this distancealong the line throughvertex G, starting at G andin the same direction as thevector.

Step 1 Draw a line through eachvertex parallel to vector .

Draw a Translation

Answer:

Step 3 Repeat Step 2 to locate points H', I', and J' toform the translated image.

Which of the following shows the translation of ΔABC along the translation vector?

A. B.

C. D.

Translations in the Coordinate Plane

A. Graph ΔTUV with vertices T(–1, –4), U(6, 2), and V(5, –5) along the vector –3, 2.

Translations in the Coordinate Plane

The vector indicates a translation 3 units left and 2 units up.

(x, y) → (x – 3, y + 2)

T(–1, –4) → (–4, –2)

U(6, 2) → (3, 4)

V(5, –5) → (2, –3)

Answer:

Translations in the Coordinate Plane

B. Graph pentagon PENTA with vertices P(1, 0), E(2, 2), N(4, 1), T(4, –1), and A(2, –2) along the vector –5, –1.

Translations in the Coordinate Plane

The vector indicates a translation 5 units left and 1 unit down.

(x, y) → (x – 5, y – 1)

P(1, 0) → (–4, –1)

E(2, 2) → (–3, 1)

N(4, 1) → (–1, 0)

T(4, –1) → (–1, –2)

A(2, –2) → (–3, –3)

Answer:

A. A'(–2, –5), B'(5, 1), C'(4, –6)

B. A'(–4, –2), B'(3, 4), C'(2, –3)

C. A'(3, 1), B'(–4, 7), C'(1, 0)

D. A'(–4, 1), B'(3, 7), C'(2, 0)

A. Graph ΔABC with the vertices A(–3, –2), B(4, 4), C(3, –3) along the vector –1, 3. Choose the correct coordinates for ΔA'B'C'.

B. Graph □GHJK with the vertices G(–4, –2), H(–4, 3), J(1, 3), K(1, –2) along the vector 2, –2. Choose the correct coordinates for □G'H'J'K'.

A. G'(–6, –4), H'(–6, 1), J'(1, 1), K'(1, –4)

B. G'(–2, –4), H'(–2, 1), J'(3, 1), K'(3, –4)

C. G'(–2, 0), H'(–2, 5), J'(3, 5), K'(3, 0)

D. G'(–8, 4), H'(–8, –6), J'(2, –6), K'(2, 4)

Describing Translations

A. ANIMATION The graph shows repeated translations that result in the animation of the raindrop. Describe the translation of the raindrop from position 2 to position 3 in function notation and in words.

Describing Translations

The raindrop in position 2 is (1, 2). In position 3, this point moves to (–1, –1). Use the translation function (x, y) → (x + a, y + b) to write and solve equations to find a and b.

(1 + a, 2 + b) or (–1, –1)

1 + a = –1 2 + b = –1

a = –2 b = –3

Answer: function notation: (x, y) → (x – 2, y – 3)So, the raindrop is translated 2 units left and 3 units down from position 2 to 3.

Describing Translations

B. ANIMATION The graph shows repeated translations that result in the animation of the raindrop. Describe the translation of the raindrop from position 3 to position 4 using a translation vector.

(–1 + a, –1 + b) or (–1, –4)

–1 + a = –1 –1 + b = –4

a = 0 b = –3

Answer: translation vector:

A. (x, y) → (x + 3, y + 2)

B. (x, y) → (x + (–3), y + (–2))

C. (x, y) → (x + (–3), y + 2)

D. (x, y) → (x + 3, y + (–2))

A. The graph shows repeated translations that result in the animation of the soccer ball. Choose the correct translation of the soccer ball from position 2 to position 3 in function notation.

B. The graph shows repeated translations that result in the animation of the soccer ball. Describe the translation of the soccer ball from position 3 to position 4 using a translation vector.

A. –2, –2

B. –2, 2

C. 2, –2

D. 2, 2