Rotations

Rotations

How can we rotate a point or figure?

SWBAT apply rotations rules

What does it look like?

click to the next slide

What word can we use to describe the rotation?

We SPIN the figure!

Let me guess there is a rule... Yes!

Here is the rule:

(x, y) = (-x, -y)

What does (-x, -y) mean?

It means you change the sign of x and change the sign of y.

If x is negative, changes to positive

If x is positive ,changes to negative

If y is negative, changes to positive

If y is positive, changes to negative

Poll

What word do we associate with a rotation?

• flip

• flop

• spin

Multiple Choice

If we rotate figure 180 degrees and the x is negative what does it change to?

• negative

• positive

• no change

Multiple Choice

If we rotate a figure 180 degrees and the y value is positive, what does it change to?

• positive

• negative

• no change

Multiple Choice

If line segment XY has vertices x(-8,9) y(-1,-2) what are the image coordinates after a reflection of 180 degrees?

• x(8.-9) y(1,2)

• x(0,0) y (0,0)

• x(-8,9) y(-1,-2)

Multiple Choice

If triangle ABC has vertices A(-2,3) B(3,2) C(-5,6) what are the image coordinates after a reflection of 180 degrees?

• A(-2,3) B(3,2) C(-5,6)

• A(2,-3) B(-3,-2) C(5,-6)

Poll

True or False. The image shows a rotation?

• True

• False

Open Ended

Rotate triangle ABC with vertices A(1,2) B(3,4) C(5,6) 180 degrees.

Open Ended

Rotate triangle ABC with vertices A(-1,-2) B(-3,-4) C(-5,-6) 180 degrees.