3 dimensional geometry

We are living in 3 dimensional world.Number of dimension is determined by co-ordinate axes.3 dimension means, there are 3 co-ordinate axes.And axes means those straight lines that intersects at a  point called origin at right angle i.e. 90 degree.Similarly, 4 dimensional objects means that objects which exist in the space with 4 co-ordinate axes.And the magic of the world is that there may be infinite dimensional world.

You are standing in any place of the earth then to find out your location where you live there used 3 dimensional geometry.
 

 In the picture above, OX, OY and OZ are 3 axes which intersects at origin O with co-ordinates (0,0,0).As there is 3 axes, it is 3 dimensional.Using this type of co-ordinate system, location of any objects can be found in the world.Suppose in above space(in picture), your sister is at P.Then,your Position will be (x,y,z) this means from origin (you may also call point of reference) going x units along x-axis (OA) then from A y units along y-axis (AB) then you reach at B and from B go z units along z-axis (OP). then finally you get your sister at point P.So,this system is so convenient to find out the location and study.
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