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Mathematics 8 Online
OpenStudy (anonymous):

ummm...what is a plane

OpenStudy (anonymous):

jimthompson5910 (jim_thompson5910):

the simplest explanation is that it's a flat surface that extends infinitely in every direction (think of a table top that never ends)

jimthompson5910 (jim_thompson5910):

why did you post those 4 figures?

OpenStudy (anonymous):

it has something to do with those

jimthompson5910 (jim_thompson5910):

can you be more specific? is that all the instructions say?

OpenStudy (anonymous):

Look at the polygons shown below. Which of these polygons will tessellate a plane?

OpenStudy (e.mccormick):

There is one axiom that might apply. Any three points determine a plane.... OH! tessellate! Tiling. OK.... That is different...

OpenStudy (anonymous):

ok

jimthompson5910 (jim_thompson5910):

to tessellate a plane is to break it up into pieces, but each piece fits together perfectly two examples of tessellation a) floor tiles fit together perfectly and they cover the entire floor b) a jigsaw puzzle has each piece fitting together to create a larger image or shape

jimthompson5910 (jim_thompson5910):

so is there any way to use octagons to tessellate the plane?

OpenStudy (e.mccormick):

Some visual examples may also help. http://www.mathsisfun.com/geometry/tessellation.html

OpenStudy (anonymous):

ok do it they have to be able to put more than one together to make a bigger peice

OpenStudy (anonymous):

and yes

OpenStudy (anonymous):

dont 1 and 2 both work?

jimthompson5910 (jim_thompson5910):

in other words, is it possible to glue the edges of a bunch of octagons and have them fill up the plane (but no gaps are allowed, every bit of space must be covered)

OpenStudy (anonymous):

ok so that means octagons dont work

jimthompson5910 (jim_thompson5910):

correct

jimthompson5910 (jim_thompson5910):

octagons will not tessellate the plane

jimthompson5910 (jim_thompson5910):

regular octagons that is

OpenStudy (anonymous):

so figures 1 nd 12 will be the two

jimthompson5910 (jim_thompson5910):

good, triangles will always tessellate the plane (no matter what type of triangle you're dealing with) you can combine two triangles to form a rhombus, which will also tessellate the plane

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