rotations (day 2)

HousekeepingYesterday we discussed rotations.

Did you complete IXL Skills Q.6 & Q.7???

Unit 2 Lesson 2: Reflections and Rotations

Goal for today….• Identify the image of a figure after a

given rotation.• Analyze a graph to determine the angle

and direction of rotation of a figure.

Example: Graphing Rotations on a Coordinate PlaneGraph the rotation of triangle XYZ 180 about the origin.Multiply the both coordinates by –1.

Rule ImageX(–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’

ResourcesVirtual 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

Wrap UpToday we learned to transform plane

figures using rotations.

Questions?

What now?• Shapes in motion activity• U2L2 Quiz