Tuesday, Oct 30

Wedneday, March 5 Chapter13-5

Symmetry

SymmetryThere are many types of symmetry.

SymmetryRotational symmetry is when a shape can be rotated less than 360 and look exactly the same.

SymmetryRotational symmetry is when a shape can be rotated less than 360 and look exactly the same.

The order is how many matches there are as the shape is rotated once.

SymmetryRotational symmetry is when a shape can be rotated less than 360 and look exactly the same.

The order is how many matches there are as the shape is rotated once.

Shapes are considered to have rotational symmetry if they have more than one order.

SymmetryHow many orders of rotational symmetry does this shape have?

SymmetryHow many orders of rotational symmetry does this shape have?

SymmetryHow many orders of rotational symmetry does a regular pentagon have?

SymmetryHow many orders of rotational symmetry does a regular pentagon have?

5

SymmetryHow many orders of rotational symmetry does this shape have?

SymmetryHow many orders of rotational symmetry does this shape have?

8

SymmetryHow many orders of rotational symmetry does this shape have?

SymmetryHow many orders of rotational symmetry does this shape have?

1

Does it have rotational Symmetry?

SymmetryHow many orders of rotational symmetry does this shape have?

1

Does it have rotational Symmetry? No

SymmetryHow many orders of rotational symmetry does this shape have?

SymmetryHow many orders of rotational symmetry does this shape have?

3 consider the color.

SymmetryPoint symmetry is when every part has a matching part the same distance from a central point, but in an opposite direction.

SymmetryThis shape has point symmetry.

All the spots on the shape are the same distance from a central point, but in an oppositedirection.

SymmetryPlaying cards often have point symmetry so they look the same from the top or bottom .

SymmetryWhich shapes have point symmetry?

SymmetryWhich shapes have point symmetry?

A and C

SymmetryA shape has line symmetry, or reflection symmetry, if it can be folded in half so the two halves match exactly.

SymmetryCan this be folded along the dotted line to create a line of symmetry?

SymmetryCan this be folded along the dotted line to create a line of symmetry?

No

SymmetryCan this be folded along the dotted line to create a line of symmetry?

SymmetryCan this be folded along the dotted line to create a line of symmetry?

Yes.

SymmetryThis picture was made symmetrical by using a computer. The white line is the line ofsymmetry.

SymmetryThe line ofsymmetry, sometimes called a mirror line, does not have to be up to down, or left to right. It can be in any direction.

SymmetryThis shape has a horizontal line ofsymmetry.

SymmetrySometimes there are more than one line of symmetry.

A regular triangle(equilateral) has three lines of symmetry.

SymmetryA regular quadrilateral (square) has four lines of symmetry.

LSymmetryA regular pentagon has five lines of symmetry.

SymmetryIs there a pattern?

SymmetryIn any regular polygon, the number of lines of symmetry is equal to the number of sides.

SymmetryHow many lines of symmetry does a circle have?

SymmetryA circle has an infinite numbers of lines of symmetry.

SymmetryAdditional note on Blizzard Bags

Tear off the instruction page and place in your notes. Write your name and period you have math in the upper right hand corner of the worksheet.

SymmetryAgenda Notes

Homework Practice Skills 13-5Due Thursday, March 6

Chapter 13 TestMonday, March 10