## Monday, May 15, 2006

### Kim's Growing Post

#1. What is meant by the terms "rotation symmetry" and "reflection symmetry?" How does this relate to pentominoes? Explain these terms so that anyone who reads your post understands what you mean.

rotational symmetry: is symmetry with respect to some or all rotations. Therefore a symmetry group of rotational symmetry is a subgroup.

reflection symmetry: it is the most common type in symmetry. In 2D, there is an axis of symmetry, in 3D a plane of symmetry. An object or figure which is indistinguishable from its transformed image is called mirror symmetry.

Rotation and reflection symmetry is related to pentominoes because there are only 12 pentominoe shapes and some people have found more but if you use rotation or reflection symmetry, you will see the same pentoninoe shape but in a different position.

#2.

#3. My pattern starts with one block and you just keep adding one block more to every step and this pattern can keep on going or it can have a ending.

#4.

At 5/16/2006 5:10 PM,  Candy said...

great job Kim

At 5/19/2006 3:38 PM,  Smiiliies said...

Thank you Candy

At 5/20/2006 12:04 PM,  Mr. Reece said...

Kim you didn't relate rotation and reflection symmetry to pentominoes. Your mark is 18/20

At 5/22/2006 12:25 PM,  amelia_ mal said...

Hey Kim! great job. u should asck your parents if u don't understand. It's Amalia

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