Warm up1. A function is even. Point A(-3, 4) is

on the even function. Name another point.

2. A function is even. Point B(9, 2) is on the even function. Name another point.

3. Reflect C(-5, -3) over the y-axis.4. Reflect D(2, -4) over the x-axis.5. Reflect E(-12, 4) over y = -x.

(3, 4)

(-9, 4)C’(5, -3)D’(2, 4)

E’(-4, 12)

Review Homework

Skills CheckAre you ready?

Rotations

Rotate 90 Clockwise about the Origin

(Same as 270 Counterclockwise)

Change the sign of x and switch the order

x,y y, x

Rotate 90° clockwiseabout the origin

A( 7, 3) A'( , )B(1, 4) B'( , )C(3, 1) C '( , )

Rotate 90° clockwiseabout the origin

A( 7, 3) A' 3,7B(1, 4) B' 4, 1C(3, 1) C ' 1, 3

Rotate 90 Counterclockwise about the

Origin(Same as 270 Clockwise)

Change the sign of y and switch the order

x,y y,x

Rotate 90° counterclockwiseabout the origin

E( 3, 2) ( , )F( 6, 5) ( , )G(0, 2) ( , )

Rotate 90° counterclockwiseabout the origin

E( 3, 2) E' 2, 3F( 6, 5) F' 5, 6G(0, 2) G ' 2,0

Rotate 180 about the Origin

ONLY Change the signs

,,y yx x

Rotate 180° about the origin

Q( 8, 2) Q '( , )R( 8, 9) R'( , )S( 2, 2) S'( , )T( 2, 9) T'( , )

Rotate 180° about the origin

Q( 8, 2) Q ' 8,2R( 8, 9) R' 8,9S( 2, 2) S' 2,2T( 2, 9) T' 2,9

Any figure that can be turned or rotated less than 360° about a fixed point so that the figure looks exactly as it does in its original position.

Rotational Symmetry

Ambigrams – Look the same right side up and upside down

Rotational Symmetry in the parking lot

Which figures have rotational symmetry? For those that do, describe the rotation that map the figure onto itself.

Regular pentagon

center. itsabout 72every Yes

Isosceles triangle

Rhombus

center. itsabout 180every Yes

ClassworkRotations Practice

Worksheet

HomeworkRotations HW

Worksheet