Chapter 20 Moving Plane Figures

Shapes have the same name no matter what position they are in. Recognizing congruent figures builds understanding of geometric concepts.

Objectives;

To slide, flip, and turn figures and identify each of the motions.
To identify lines of symmetry
To draw a picture of a symmetric figure to solve a problem

Vocabulary Terms to Learn; Online Dictionary for Math

slide	flip	turn
rotation	reflection	symmetry
line of symmetry

Computer Lab Activities;

E-Lab #20
Carnival Countdown/ Pattern Block Round up Levels D, G, & R
Kid Pix Deluxe... 1)sort stamps by lines of symmetry & 2)create patterns using flips, slides, and turns
Mighty Math Number Heroes Geo-computer Levels F & N

Lesson 1 Sliding , Flipping, and Turning

Shapes can be moved in many ways.
	A Slide moves an object on a plane up, down, back, or forward. The shape moves but it remains positioned the same.
	A Flip changes the direction of a figure on a plane. The back to back or front to front.
	A Turn rotates a figure on a plane like the hangs on a clock turn. Quarter turn is 90 degrees. A half turn is 180 degrees.

Practice identifying and creating your own Reflections

Transformations

Interactive Transformations

Wrapping Paper Patterns

Lesson 2 Symmetry

A line of symmetry is an imaginary line that divides a figure in half. If you fold the object on the line both halves are the same.

Which numbers have a line(s) of symmetry?

1 2 3 4 5 6 7 8 9 0

Online E-lab #20 grade 3

Online symmetry lesson

Practice Finding Symmetry Online

Visit the Butterfly Website to view symmetry in nature

Alphabet Coding Activities

Explore finding lines of symmetry in flags

Lesson 3 More About Symmetry

Lesson 4 Symmetric Patterns

Symmetry is like a mirror image. If you place a mirror on a line of symmetry you can see a reflection of the other half of the symmetrical shape. Try this with a mirror...

Experiment with pattern blocks and mirrors creating reflections of symmetry.

Use lined or dotted paper to create symmetrical objects.

Assessment Chapter 20

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