Rotations (Week 17)

Rotations (Week 17)

Open Ended

Do Now: What is a rotation? (Write down the definition from your notes)

Multiple Choice

"Clockwise" refers to which direction?

• To the left

• To the right

Multiple Choice

"Counter-Clockwise" refers to which direction?

• To the left

• To the right

Rotations

• A rotation is a change in orientation.

• A rotation is also a circular turn around a fixed point

Rotation Rules for Positive Values

(Counter-Clockwise = To the Left)

Fill in the Blanks

Let's Practice! For R90, the rule is (-y, x). Where would (3,6) be after a 90 degree counter clockwise rotation?

Fill in the Blanks

Let's Practice! For R180, the rule is (-x, -y). Where would (3,6) be after a 180 degree counter clockwise rotation?

Fill in the Blanks

Let's Practice! For R270, the rule is (y, -x). Where would (3,6) be after a 270 degree counter clockwise rotation?

Rotation Rules for Negative Values

(Clockwise Direction = To the right)

Open Ended

Using your notes, write the rule for 270 degree CLOCKWISE rotation. Go!

Fill in the Blanks

Now apply the rule (-y, x) to the point (8, 10). Where's the new point going to be?

Let's try this one!

First Step to this problem: Write down all the pairs of points on paper.

Multiple Choice

Step Two: Find the Rule

What rule are we going to apply for this problem? (Check your notes and find the correct rule)

• (-y, x)

• (-x, -y)

• (y, -x)

Rotation Rules for Positive Values

(Counter-Clockwise = To the Left)

Step Three: Apply the Rule and write down the new pairs of points