Why must things that are able to rotate in circle shape ?

Subject: Why must things that are able to rotate in circle shape ?

Date: Wed Apr 19 08:47:19 2000
Posted by Stacy
Grade level: 10-12 School: Jurong Junior College
City: xyz State/Province: abc Country: singapore
Area of science: Physics
ID: 956152039.Ph

Message:


I am a student doing a project on the topic 'Circle'. My group and I find 
that circle is a shape that is commomly used. It is everywhere, like 
gears, bottle caps, manhole, pulley, any things that needed to rotate. Is 
there any history that which people discover the use of circle? or it just 
come naturally? Thank you!

Re: Why must things that are able to rotate in circle shape ?

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