DO NOW
• Find your assigned seat.
• Take out your same sheet of paper from
Wednesday. (It should be in the bin.)
• Set your culture bag on your desk if you have not
presented.
BUILDING CULTURE
PRESENTATIONS
• When it is your turn to present, project your voice.
• Explain your bag and quote.
• Explain how each item represents who you are.
• When it is not your turn to present, listen silently.
• On your piece of paper, write down the name of
each presenter.
• Write down two things you learn about each person
next to their name.
CLASS COMPETITION
• See if you can beat my other classes (fastest and
quietest) at:
• Turning in an assignment.
• Exiting the classroom.
• Entering the classroom.
• Rotations
• Checking out computers
• Putting chairs up
• Taking chairs down.
PRETEST
Take out scratch paper and a pencil.
DO NOT write on the test itself.
Do your best to answer all 20 questions.
When you finish, check out your assigned computer
Go to www98.achievedata.zoom/test
Enter your code (see my website for "Geometry
Pretest Codes")
• Submit your answers until you see a score. Show Ms.
Forsyth your score before you log off.
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INTRO TO GEOMETRY
TODAY’S OBJECTIVES
• Discover geometry in nature, art and world cultures
• Discover the characteristics of reflectional and
rotational symmetry
• Develop Problem Solving Skills
INTRO TO GEOMETRY
• “Geo” means earth
• “Metres” means measure
• Geometry began as the study of earth measure
GEOMETRY IN NATURE AND ART
• What characteristics do these figures have that
make them pretty, nice, balanced, or regular?
SYMMETRY
• A geometric characteristic of both nature and art.
• Two main types:
• Reflectional symmetry – you can fold it along a line
of symmetry so that all points on one side of the line
exactly match with all the points on the other side
of the line.
• Rotational symmetry – it looks the same after you
turn it around a point by less than a full circle.
ROTATIONAL SYMMETRY
• 5-fold rotational symmetry
ROTATIONAL SYMMETRY
• 4-fold rotational symmetry
REFLECTIONAL SYMMETRY
• Two lines of reflectional symmetry
PARTNER DISCUSSION
• Turn to a partner and explain both types of
symmetry.
• Give a NEW example of each.
REVIEW
THINK OUTSIDE THE BOX
• What kind of symmetry does this figure have?
WHICH PLAYING CARDS HAVE…
• Rotational symmetry?
• Reflectional symmetry?
EXIT SLIP
• Create a simple design that has two lines of
reflectional symmetry.
• Does it have rotational symmetry?