rotations (day 2)
TRANSCRIPT
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