Exit Ticket 90 Degree Rotation

Rotation Rules (clockwise):

90^o rotation: (x, y)→(y, -x)

What are the coordinates for A' after a 90^⁰ rotation clockwise?

• (1, 3)

• (3, 1)

• (3, -1)

• (1, -3)

Find the image of triangle ABC after rotating 90 degrees counterclockwise about the origin. What are the coordinates of C' ?

• (3, -4)

• (-4, -3)

• (4, 3)

• (-3, 4)

Answer explanation

What would be the location of A' after a 90 degree counterclockwise rotation of point (A) ?

Hint: Look for point A and apply the rule (x, y) → (–y, x)

• (-1, 2)

• (2, -1)

• (-2, -1)

• (-1, -2)

What is this picture an example of? 

• An angle

• A cat vertex 

• Rotation 

• Dilation

Triangle A is rotated 90° clockwise with the origin as the center of rotation to create a new figure. Which rule describes rotating 90° clockwise?

• (x,y)→(y, -x) 

• (x,y)→(-x,-y)

• (x,y)→(-y,x)

• (x,y)→(x,y)

Triangle ABC was transformed using the rule (x,y) → (–y,x). The vertices of the triangles are shown.

A (–1, 1)B (1, 1)C (1, 4) A' (–1, –1)B' (–1, 1)C' (–4, 1)

Which best describes the transformation?

• The transformation was a 90° rotation about the origin

• The transformation was a 180° rotation about the origin.

• The transformation was a 270° rotation about the origin.

• The transformation was a 360° rotation about the origin.

If point (5,2) is rotated counterclockwise 90° about the origin, its image will be point.

• (2,5)

• (2,-5)

• (-2,5)

• (-5,-2)

How many degrees was the figure rotated?

• 90 degrees counterclockwise 

• 180 degrees

• 90 degrees clockwise