The document discusses rotations and transforming figures using rotations. It provides examples of rotating a triangle 180 degrees about the origin by multiplying the coordinates by -1. It also lists some Virtual Nerd links on rotations for 90, 180, and 270 degrees around the origin. Finally, it asks if there are any questions after learning about rotations and mentions next steps like a shapes in motion activity and a quiz.

1. Yesterday we discussed rotations.
Did you complete IXL Skills Q.6 & Q.7???

2. Unit 2 Lesson 2:
Reflections and Rotations

3. • Identify the image of a figure after a
given rotation.
• Analyze a graph to determine the angle
and direction of rotation of a figure.

13. Example: Graphing Rotations on a Coordinate Plane
Graph the rotation of triangle XYZ 180 about
the origin.
Multiply the both coordinates
by –1.
Rule Image
X(–1, 2)X’ (–1  –1, –1  2 ) X’(1, –2)
Y(2, 3)Y’ (–1  2, –1  3) Y’(–2, –3)
Z(3, 0)Z’ (–1  3, –1  0) Z’(–3, 0)
Z’
Y’
X’

16. Virtual Nerd – What is a Rotation?
http://www.virtualnerd.com/geometry/fundamentals/rotation-definition.php
Virtual Nerd – How do you rotate a figure 90 degrees around the origin?
http://www.virtualnerd.com/pre-algebra/geometry/transformations-
symmetry/rotating-figures/rotate-90-degrees-about-origin
Virtual Nerd – How do you rotate a figure 180 degrees around the origin?
http://www.virtualnerd.com/pre-algebra/geometry/transformations-
symmetry/rotating-figures/rotate-180-degrees-about-origin
Virtual Nerd – How do you rotate a figure 270 degrees around the origin?
http://www.virtualnerd.com/pre-algebra/geometry/transformations-
symmetry/rotating-figures/rotate-270-degrees-about-origin

17. Today we learned to transform plane
figures using rotations.
Questions?
What now?
• Shapes in motion activity
• U2L2 Quiz