View by Category

Loading...

PPT – Symmetry PowerPoint presentation | free to download

The Adobe Flash plugin is needed to view this content

About This Presentation

Write a Comment

User Comments (0)

Transcript and Presenter's Notes

Symmetry

Line Symmetry

- Shape has line symmetry when one halfof it is

the mirror image of the other half.

- Symmetry exists all around us and many people see

it as being a thing of beauty.

Line Symmetry

- If a shape can be folded in half so that one half

fits exactly on top of the other, then we say

that the shape has got line symmetry. - The fold is called a line of symmetry.
- This shape has got a vertical line of symmetry.

Line Symmetry in the Alphabet

- Which letters have got lines of symmetry?

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

Lines of Symmetry all around us

- Which of these road signs have got lines of

symmetry?

Is a butterfly symmetrical?

Examples of line symmetry

Animals that have Line Symmetry

- Here are a few more great examples of mirror

image in the animal kingdom.

- This photograph shows 2 lines of symmetry. One

vertical, the other along the waterline. - (Notice how the prayer towers, called minarets,

are reflected in the water and side to side).

Rotational Symmetry

- When a shape is rotated about its centre, if it

comes to rest in a position and looks exactly

like the original, then it has rotational

symmetry - A shape like an equilateral triangle would have

an order of rotational symmetry of 3

Rotational Symmetry

- The general rule for a regular polygon (shapes

such as pentagons, heptagons, octagons etc.) is,

that the number of sides is the same as the

number of lines of symmetry, which is also the

same as therotational symmetry order.

http//illuminations.nctm.org/imath/912/sy_rotatio

ns/page3.html

Rotational Symmetry

- If, when you rotate a shape, it looks exactly the

same as it did in its original position, then we

say that the shape has got rotational symmetry. - This square has got rotational symmetry.

- It looks exactly the same four times in a full

turn. - It has got rotational symmetry order 4.

Rotational Symmetry

- Does this rectangle have rotational symmetry?

- It looks exactly the same twice in a full turn.
- It has got rotational symmetry order 2.

Rotational Symmetry in the Alphabet

- Which letters have got rotational symmetry?

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

Order 2

Order 2

Order 2

Order 2

S

T

U

V

W

X

Y

Z

Order 2

Order 2

Order 2

Rotational Symmetry all around us

Order 3

Order 2

Order 2

Rotational Symmetry all around us

Order 4

Order 3

Order 2

Plane Symmetry

- Plane symmetry concerns three-dimensional shapes

or solids. - Just as two-dimensional shapes can have a mirror

line, so solid three-dimensional shapes can have

a plane of symmetry. - The symmetry planes of an object are imaginary

mirrors in which it can be reflected while

appearing unchanged

Plane Symmetry

Plane Symmetry

Plane Symmetry

Tesselation

- A collection of shapes that fit together to cover

a surface without overlapping or leaving gaps - May also be referred to as tiling
- They can be regular or irregular
- a regular tessellation is made up of congruent

regular polygons - triangles, squares or hexagons

Tiling with regular polygon

- The only regular polygons that can tile the plane

are - Equilateral Triangle
- Square
- Hexagon
- and no more!!

Whats wrong with the other regular polygons??

Pentagon

Regular heptagon and those with more sides

Tesselation

- Can be an irregular tesselation

About PowerShow.com

PowerShow.com is a leading presentation/slideshow sharing website. Whether your application is business, how-to, education, medicine, school, church, sales, marketing, online training or just for fun, PowerShow.com is a great resource. And, best of all, most of its cool features are free and easy to use.

You can use PowerShow.com to find and download example online PowerPoint ppt presentations on just about any topic you can imagine so you can learn how to improve your own slides and presentations for free. Or use it to find and download high-quality how-to PowerPoint ppt presentations with illustrated or animated slides that will teach you how to do something new, also for free. Or use it to upload your own PowerPoint slides so you can share them with your teachers, class, students, bosses, employees, customers, potential investors or the world. Or use it to create really cool photo slideshows - with 2D and 3D transitions, animation, and your choice of music - that you can share with your Facebook friends or Google+ circles. That's all free as well!

For a small fee you can get the industry's best online privacy or publicly promote your presentations and slide shows with top rankings. But aside from that it's free. We'll even convert your presentations and slide shows into the universal Flash format with all their original multimedia glory, including animation, 2D and 3D transition effects, embedded music or other audio, or even video embedded in slides. All for free. Most of the presentations and slideshows on PowerShow.com are free to view, many are even free to download. (You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all.) Check out PowerShow.com today - for FREE. There is truly something for everyone!

You can use PowerShow.com to find and download example online PowerPoint ppt presentations on just about any topic you can imagine so you can learn how to improve your own slides and presentations for free. Or use it to find and download high-quality how-to PowerPoint ppt presentations with illustrated or animated slides that will teach you how to do something new, also for free. Or use it to upload your own PowerPoint slides so you can share them with your teachers, class, students, bosses, employees, customers, potential investors or the world. Or use it to create really cool photo slideshows - with 2D and 3D transitions, animation, and your choice of music - that you can share with your Facebook friends or Google+ circles. That's all free as well!

For a small fee you can get the industry's best online privacy or publicly promote your presentations and slide shows with top rankings. But aside from that it's free. We'll even convert your presentations and slide shows into the universal Flash format with all their original multimedia glory, including animation, 2D and 3D transition effects, embedded music or other audio, or even video embedded in slides. All for free. Most of the presentations and slideshows on PowerShow.com are free to view, many are even free to download. (You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all.) Check out PowerShow.com today - for FREE. There is truly something for everyone!

presentations for free. Or use it to find and download high-quality how-to PowerPoint ppt presentations with illustrated or animated slides that will teach you how to do something new, also for free. Or use it to upload your own PowerPoint slides so you can share them with your teachers, class, students, bosses, employees, customers, potential investors or the world. Or use it to create really cool photo slideshows - with 2D and 3D transitions, animation, and your choice of music - that you can share with your Facebook friends or Google+ circles. That's all free as well!

For a small fee you can get the industry's best online privacy or publicly promote your presentations and slide shows with top rankings. But aside from that it's free. We'll even convert your presentations and slide shows into the universal Flash format with all their original multimedia glory, including animation, 2D and 3D transition effects, embedded music or other audio, or even video embedded in slides. All for free. Most of the presentations and slideshows on PowerShow.com are free to view, many are even free to download. (You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all.) Check out PowerShow.com today - for FREE. There is truly something for everyone!

For a small fee you can get the industry's best online privacy or publicly promote your presentations and slide shows with top rankings. But aside from that it's free. We'll even convert your presentations and slide shows into the universal Flash format with all their original multimedia glory, including animation, 2D and 3D transition effects, embedded music or other audio, or even video embedded in slides. All for free. Most of the presentations and slideshows on PowerShow.com are free to view, many are even free to download. (You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all.) Check out PowerShow.com today - for FREE. There is truly something for everyone!

Recommended

«

/ »

Page of

«

/ »

Promoted Presentations

Related Presentations

Page of

Page of

CrystalGraphics Sales Tel: (800) 394-0700 x 1 or Send an email

Home About Us Terms and Conditions Privacy Policy Contact Us Send Us Feedback

Copyright 2014 CrystalGraphics, Inc. — All rights Reserved. PowerShow.com is a trademark of CrystalGraphics, Inc.

Copyright 2014 CrystalGraphics, Inc. — All rights Reserved. PowerShow.com is a trademark of CrystalGraphics, Inc.

The PowerPoint PPT presentation: "Symmetry" is the property of its rightful owner.

Do you have PowerPoint slides to share? If so, share your PPT presentation slides online with PowerShow.com. It's FREE!