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 July 20th, 2017, 11:06 PM #1 Senior Member   Joined: Nov 2015 From: hyderabad Posts: 236 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
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 Originally Posted by Lalitha183 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
In Mathematics: any Length, Width and Height are dimensions.

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...sions-reality/

July 21st, 2017, 12:33 AM   #3
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 Originally Posted by sagar233 In Mathematics: any Length, Width and Height are dimensions. 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...sions-reality/

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 3-dimensional ?

Thanks alotðŸ˜Š

July 21st, 2017, 12:41 AM   #4
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 Originally Posted by Lalitha183 Thanks for the explanationï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ 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 3-dimensional ? Thanks alotï¿½ï¿½ï¿½ï¿½ï¿½ï¿½
No, it doesn't matter what is the co-ordinate, only things matter is the shape of object.

Suppose, you have a point at three co-ordinates ( 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: 236 Thanks: 2 okay... I think I have understood it now. Thank you sagar í ½í¸Š
July 21st, 2017, 12:49 AM   #6
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 Originally Posted by Lalitha183 okay... I think I have understood it now. Thank you sagar í ½í¸Š
Welcome

 July 21st, 2017, 01:59 AM #7 Senior Member   Joined: Jun 2015 From: England Posts: 915 Thanks: 271 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: 20,929 Thanks: 2205 A circle is 1-dimensional (just the outline), whereas a disk is 2-dimensional. I don't recall a corresponding separate term for the 2-dimensional surface whose outline is a square, a rectangle or any other polygon. However, a sphere is 2-dimensional, whereas a ball is 3-dimensional. 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
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 Originally Posted by skipjack I don't recall a corresponding separate term for the 2-dimensional surface whose outline is a square, a rectangle or any other polygon.
2-dimensional manifold with corners.

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