July 20th, 2017, 11:06 PM  #1 
Senior Member Joined: Nov 2015 From: hyderabad Posts: 167 Thanks: 2  Dimensions
How to identify the dimension of the shapes ? Like a line, a curve or a circle is one dimensional since it just says about the curcumference or the outline of that particular shape. Shapes like disk, rectangle, triangle etc are two dimensional since it talks about the area of the shape including the outline... Am I correct with the understanding or help me to understand the dimensions clearly... Thanks 
July 21st, 2017, 12:20 AM  #2  
Senior Member Joined: Jun 2017 From: India Posts: 143 Thanks: 4  Quote:
For Example Point don't have any length, width or height. So, it has Zero dimension (0D). Line is having length, so it has 1 dimension (1D). Circle, Triangle, Square, Pentagon or any Polygon are having length and width. So, these are 2 dimension (2D). Cube, Cuboid, Prism, Cylinder, Sphere, Cones and Everything we see from our Eyes are having length, width and height. So these are having 3 dimension (3D). In Physics there are more than just 3 dimensions and most of them are not verified (and are used as science fiction): Check this one: https://ultraculture.org/blog/2014/1...sionsreality/  
July 21st, 2017, 12:33 AM  #3  
Senior Member Joined: Nov 2015 From: hyderabad Posts: 167 Thanks: 2  Quote:
Thanks for the explanationðŸ˜Š I also want to get clarified on cartesian plan! If a cartesian plane has 2 coordinates as A&B then it is two dimensional and if it has 3 coordinates as X,Y& Z then it is 3dimensional ? Thanks alotðŸ˜Š  
July 21st, 2017, 12:41 AM  #4  
Senior Member Joined: Jun 2017 From: India Posts: 143 Thanks: 4  Quote:
Suppose, you have a point at three coordinates ( 5, 6, 8 ), it doesn't mean it's a 3 dimensional. It will still zero dimensional.  
July 21st, 2017, 12:45 AM  #5 
Senior Member Joined: Nov 2015 From: hyderabad Posts: 167 Thanks: 2 
okay... I think I have understood it now. Thank you sagar í ½í¸Š 
July 21st, 2017, 12:49 AM  #6 
Senior Member Joined: Jun 2017 From: India Posts: 143 Thanks: 4  
July 21st, 2017, 01:59 AM  #7 
Senior Member Joined: Jun 2015 From: England Posts: 644 Thanks: 184 
One point to add to sagar's excellent introduction. In geometry a line means a straight line. Any line like object that is not a straight is called a curve. 
July 21st, 2017, 12:17 PM  #8 
Global Moderator Joined: Dec 2006 Posts: 17,739 Thanks: 1361 
A circle is 1dimensional (just the outline), whereas a disk is 2dimensional. I don't recall a corresponding separate term for the 2dimensional surface whose outline is a square, a rectangle or any other polygon. However, a sphere is 2dimensional, whereas a ball is 3dimensional. A straight line is a particular case of a curve. A line is not necessarily straight (though it usually is); for example, no line of longitude (of the earth) is straight. Last edited by skipjack; July 21st, 2017 at 12:22 PM. 
July 21st, 2017, 12:19 PM  #9 
Senior Member Joined: Oct 2009 Posts: 141 Thanks: 59  

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