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```									     Homework 3C1
• Define: Tessellation.
• Copy the Yellow box on
book.
• Finish: Worksheet 3-5
Drill 3C1
1. Solve for x

X+2 = 7
10    7
Drill 3C1
2. Copy rectangle RECT and
point P. Rotate the rectangle
Homework 3C1
• Define: Tessellation.
• Copy the Yellow box on
book.
• Finish: Worksheet 3-5
Drill 3C1  X+2 = 7
1. Solve for x 10 7
7(X+2) = 7(10)
7X+14 =70
S14   7X = 56
D7           X=8
Drill 3C1
2. Copy rectangle RECT and
point P. Rotate the rectangle 90°
C’

T’
P
E’

R’
Symmetry
Objective: The student
will find and locate the
line of and point of
symmetry of images.
Vocabulary: Symmetry
Symmetry - a figure has a point or .
line about which it maps onto itself.
Types of Symmetry – Rotational
Symmetry & Line Symmetry
Rotational Symmetry – a figure
rotates 1800 or less about a fixed
point to map onto itself.
Line Symmetry- a figure reflects
over a line to map onto itself.
Example of Symmetry
A’B’C’D’ is the reflected image of
ABCD over the line l .
D’        C’
This is the A                     B
line of   l
reflection.   A’                  B’
D         C
Notice that the      A’B’C’D’ is
ABCD is the
orientation has     the copy or
reversed  original or
preimage. image.
Example of Symmetry
H’G’K’L’ is the image of HGKL rotated
KH’        J
G’
GKJH is the original
or preimage.
P
Notice that the
G J’       H
K’      orientation has
not reversed
G’K’J’H’ is the      P is the point
copy or image.        of rotation.
problems on
worksheet 3-5 of
Closing Problems
1. Which figure has both line and
rotational symmetry?

F.                        G.

J.                       H.
Closing Problems
2. How many lines of symmetry
does the figure below have?