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.

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?