Reflections and Dilations

∆QRS contains the points: Q(4, 2) R(5, 1) S(3,7). If the triangle is reflected across the y-axis, what will S' be?

• S'(3, 7)

• S'(-3, 7)

• S'(-3, -7)

• S'(3, 7)

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Reflect over x-axis. Which point would be at (3, -6)

• A

• B

• C

• H

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

What Transformation is visible?

• Reflection

• Translation

• Rotation

• Dilation

Tags

CCSS.8.G.A.4

CCSS.HSG.SRT.A.2

What type of transformation occurred?

• Translation

• Reflection

• Dilation

Answer explanation

a DILATION changes the SIZE of an image, therefore a dilation has occurred.

Tags

CCSS.HSG.CO.A.2

What scale factor was used to dilate IJKL to create I'J'K'L'?

• SF=3

• SF=4

Answer explanation

The image was reduced, so the SF must be less than 1. Set up the ration NEW over OLD.

Tags

CCSS.8.G.A.3

The triangle was reflected across the y-axis.  Which algebraic representation best describes this transformation?

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

What type of transformation occurred?

• Translation

• Reflection

• Dilation

Answer explanation

Notice the letter positions, they have FLIPPED. Therefore, it is a reFlection.

Tags

CCSS.HSG.CO.A.2

• The image got smaller because the scale factor is greater than one.

• The image got bigger because the scale factor is greater than one.

• The image got smaller because the scale factor is less than one.

• The image is congruent because the scale factor is less than one.

Tags

CCSS.8.G.A.3

What scale factor was used to dilate DFGH to create D'F'G'H'?

• SF=2

• SF=4

Answer explanation

The image was reduced, so the SF must be less than 1. Set up the ration NEW over OLD.

Tags

CCSS.8.G.A.3

Which rule describes the dilations from PNDM to P'N'D'M'?

Answer explanation

The image was enlarged, so the SF must be greater than 1. Set up the ratio NEW over OLD.

Tags

CCSS.HSG.CO.A.2