4A 7-2 slides: Intro to Symmetry

SYMMETRYSYMMETRY

WALT

• What a symmetric figure is• How to identify a line of symmetry• State what happens when you fold a

symmetric object about its line of symmetry

These are symmetric figures

What you see are lines of symmetry

The halves along the line are mirror images of each other

I like to fold it, fold it

• Your worksheet is rectangular in shape.

• Fold it into two symmetric halves.

CAN YOU IMAGINE IT?

SHOW ME WHACHU GAHT

Which figures are symmetric?

a b c d e f

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Ans: a, d, e

a b c d e f

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Ma MPAH WB Pg 111: Which figures are symmetric?

Ans: B, D, E, F, G, H

Ma MPAH WB Pg 112: Which figures are symmetric?

Ans: A, C, D

• In your pairs, make a list of at least 10 examples of everyday symmetrical objects

• Pick 5 and draw them along with their lines of symmetry

Let’s hear from some of you

Now it’s time to…

The dotted lines divide these figures into equal halves, but they are not lines of symmetry.Can you explain why?

The two parts do not fit exactly when folded along the dotted line.

In which figure(s) is the dotted line a line of symmetry?

a b c d e

Ans: b, d, e

a b c d e

Now that we totally understand what symmetry is, we can MAKE a

piece of art that is symmetric

Time for an activity

In your PAIRS• Make one SYMMETRIC shape

• Make one NON-SYMMETRIC shape

Followed by: MPAH Ma WB Pg 113-114