how many lines of symmetry to these regular polygons have?
DESCRIPTION
An informal Introduction to GeometryTRANSCRIPT
How many lines of symmetry to these regular polygons have?
Bell Ringer How many lines of symmetry to these regular polygons
have? 5 4 3 Do you see a pattern? 6 8 An informal Introduction to
Geometry Definitions Topic: Symmetry symmetric line of symmetry
Name: Date:
When you can fold a figure in half so that the two halves fit
exactly on top of each other, the shape is symmetric. line of
symmetry The line that contains the fold Examples The horizontal
line through the second T is not a line of symmetry vertical line
of symmetry Symmetry To be a line of symmetry, the shape must have
two halves that match exactly.
When you trace a heart onto a piece of folded paper, and then cut
it out, the two half hearts make a whole heart. The two halves are
symmetrical. Which of these flags have a line of symmetry?
United States of America Canada No Maryland England No What about
these math symbols?
Do they have symmetry? + - Yes Yes - x Yes Yes # 2. Describe the
lines of symmetry of a circle.
To Do With Your Partner # 1. Which other letters are symmetric?
Which letters are both horizontally symmetric and vertically
symmetric? solution next slide # 2. Describe the lines of symmetry
of a circle. any line through the center of the circle A B C D E FG
H I J K L M N O P Q R S T U V W X Y Z
You can look to see if your name has symmetrical letters in it too!
A B C D E FG H I J K L M N O P Q R S T U V W X Y Z Infinite number
Definitions Prism A solid formed by translating a given base shape
into the third dimension along a line. Part of a line that contains
two endpoints and all the points between the two endpoints Line
segment Lines in the same plane that do not intersect.
Parallel Lines Planes in the same space that do not intersect
Parallel Planes Where do you see parallel lines in the classroom?
Homework p.14 # 5