Mathematicians can describe the balance or symmetry of something by using the idea of rigid motion or isometry. A rigid motion is a transformation in space or in a plane in which the original figure and the image of the original figure are congruent. There are four kinds of rigid motions in the plane. These four rigid motions are a) reflection in a line, b) rotation, c) translation and, d) glide reflection.

The simplest isometry, called bilateral symmetry, or mirror-symmetry, is reflection across a line. A figure with bilateral symmetry looks the same on both sides of a line except that the two sides of the figure are mirror images of each other. Figure 1a shows an example of a figure with a vertical line of symmetry. Figure 1b shows an example of a figure with a horizontal line of symmetry. Figure 1c shows an example of a figure with both vertical and horizontal lines of symmetry.

A simple flow chart can be used to easily classify any strip pattern with this 4-character code. This flow chart is presented by Dorothy K. Washburn and Donald W. Crowe, and is more completely described in Symmetries of Culture: Theory and Practice of Plane Pattern Analysis, published by the University of Washington Press.

credit to:

Symmetry Patterns of the Wisconsin Woodland Indians

Kim Nishimoto and Bernadette Berken

St. Norbert College

## Saturday, 2 June 2012

## Thursday, 24 May 2012

### Enjoy!:)

Lyrics:

(Jack) Math is a wonderful thing

Math is a really cool thing

So get off your "ath"

Let's do some math

Math(x5)

(Jack) Three minus Four is?

(Summer) Negative one

(Jack) That's right

(Jack) 6 times a billoin is?

(Carrot Top) 6 billion

(Jack) Nailed it

And 54 is 45 more then what is the answer Marta?

(Marta) 9

(Jack) No it's 8

(Marta) No it's 9

(Jack) Yes I was testing you it's 9 and that's a magic number

The Lion King (c) Walt Disney

Balto (c) Universal Studios

The Math Song (c) Jack Black (from School of Rock)

WE OWN NOTHING!!

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### Permainan Interaktif I

Penaakulan matematik

Langkah-langkah bermain:

1) sila pilih 'level' yang anda suka ..:-)

2) cuba jawab soalan yang diberi...GOOD LUCK...

3) senangkan??cuba soalan seterusnya..

Interested?

click

Langkah-langkah bermain:

1) sila pilih 'level' yang anda suka ..:-)

2) cuba jawab soalan yang diberi...GOOD LUCK...

3) senangkan??cuba soalan seterusnya..

Interested?

click

http://www.mathplayground.com/algebraic_reasoning.html

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## Sunday, 20 May 2012

### Penulisan Ilmiah Isu mengenai Pentaksiran

**Penulisan ilmiah SME3023**

View more documents from Dyg Khairunnisa

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### Issues on Assessment in Mathematics

**Slideshow for issues on assessment**

View more PowerPoint from Dyg Khairunnisa

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