Rotations

Question 1

Rotation

Answer 1

a transformation when a figure “turns” around a given point

Question 2

What is the given point that something rotates on?

Answer 2

center of rotation

Question 3

If the problem doesn’t specify the direction to rotate something, what direction do you go?

Answer 3

counterclockwise

Question 4

What is how much to rotate described in?

Answer 4

degrees

Question 5

What does “rotate about M” mean?

Answer 5

rotate around M

Question 6

What do you always measure the degrees to rotate around a point with? (if you have to divide by something); Why?

Answer 6

360 degrees; it’s a given, known fact

Question 7

What means clockwise in a rotation?

Answer 7

C or CW

Question 8

What means counterclockwise in a rotation?

Answer 8

CCW

Question 9

The rule for 90 degrees CCW (rotation)

Answer 9

(x, y)-> (-y, x)

Question 10

These simple rotation rules ONLY work if what’s true?

Answer 10

you’re rotating around the origin

Question 11

The rule for 180 degrees CCW (rotation)

Answer 11

(x, y)-> (-x, -y)

Question 12

The rule for 90 degrees C (rotation)

Answer 12

(x, y)-> (y, -x)

Question 13

Are rotations rigid or similarity transformations?

Answer 13

rigid

Question 14

Where is quadrant 1?

Answer 14

top right

Question 15

Where is quadrant 2?

Answer 15

top left

Question 16

Where is quadrant 3?

Answer 16

bottom left

Question 17

Where is quadrant 4?

Answer 17

bottom right