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∆KLM has vertices K(4, –1), L(5, –2), and M(1, –4). Rotate ∆KLM 180° about the origin and then reflect it across the y-axis.
Warm Up Supplies Needed: Graphing Sheet, Dry Erase Marker, Eraser, A sheet of Patty Paper
K
L
M
K
L
M
M’
K’
L’ L”
M”
K”
Corrections Due!
Identify and describe symmetry in geometric figures.
Objective
What is Symmetry?
What does it mean for a figure to map onto itself?
Draw the lines of symmetry!
eight lines of symmetry
I need a volunteer!
Tell whether each figure has line symmetry. If so, draw all of the lines of symmetry.
yes; two lines of symmetry a.
b.
c.
yes; one line of symmetry
yes; one line of symmetry
Your Turn!
Complete Reflection Questions 1-3
Quadrilateral Symmetry!
http://www.mathsisfun.com/geometry/symmetry-line-plane-shapes.html
What is Rotational Symmetry?
Draw the lines of symmetry. Describe any rotational symmetry.
I need a Volunteer!
Rotational Symmetry
Your Turn!
Complete (1-8, 12, 13, 16 )
Exit Ticket
Write Your name in Block Letters Draw any lines of symmetry that exist
