# Dale Copy of 8.GM.1 - Messing With Lisa Rotations Only

## Let's Rotate Mona!

A rotation is a transformation that is called a 'turn.' Rotations in 8th grade will normally turn around the origin (0,0). You can rotate objects clockwise (to the right) or counterclockwise (to the left). Rotations of 180 degrees clockwise are the same as rotations of 180 degrees counterclockwise.

## To work this applet...

Make sure to click on the box next to Rotate Mona. Leave the center of rotation (point A) at the origin. Note the slider under the angle box. Play with the slider some. Positive rotations are counterclockwise and negative rotations are clockwise.

## Make Mona rotate 90 degrees.

1) Where is the point (2,-4) after a rotation of 90 degrees? 2) Where is the point (5,-4) after a rotation of 90 degrees? Answer below.

## Make Mona rotate 180 degrees.

1) Where is the point (2,-4) after a rotation of 180 degrees? 2) Where is the point (5,-4) after a rotation of 180 degrees? Answer below.

## Hopefully you noticed a shortcut with rotations. Each 90 degree rotation places Mona into an adjacent quadrant with the x-value and y-value switched around. Please remember that all points in Quadrant I has a positive x and positive y. All points in Quadr

Where would the new points be if A(2,4) B(4,1) C(-3,5) after a rotation 90 degrees counterclockwise? Answer below. Use A', B', and C' to indicate the new points.