Name: ________________________
Common Core Geometry – Honors
Date: ______________
Transformations - Rigid Motions – Day 3
AIM: Rotations, Reflections, Symmetry.
Do Now:
The original triangle, labeled “A,” has
been reflected across the first line, resulting
in the image labeled with “B.”
B
Reflect the image across the second line.
A
A student looked at the image of the
reflection across the second line and
said, “That’s not the image of triangle
“A” after two reflections, that the
image of triangle “B” after a rotation.”
R
Do you agree? Why or why not?
Homework: Test Review Packet
____________________________________________________________________________
Line of symmetry of a figure:
Does every figure have a line of symmetry?
Which of the following have multiple lines of symmetry?
Line Symmetry
and
Reflectional Symmetry:
A
One Line of Symmetry
H
Two Lines of Symmetry
A Square has Four Lines
of Symmetry.
An Equilateral Triangle Has Three Lines
of Symmetry
A Scalene Triangle has No
Lines of Symmetry
A Circle has Infinite Lines
of Symmetry
For the figures below, draw all the lines of symmetry. If there are none, write "none".
1.
2.
Point Symmetry
and
Rotational Symmetry
An ellipse has rotational symmetry at
180 degrees. It also has line symmetry.
A circle has rotational symmetry at any
degree of rotation.
Can you identify these logos?
A hexagon has rotational symmetry at
60, 120, and 180 degrees.