/sci/ - Science & Math

>>9678947
Basically, you only need two coordinates to describe any point. Similarly a circle is 1-dimensional, every point is described by one number - it's angle. Because the size of the radius is fixed.


You can imagine a circle folding out to give a line, you can imagine a sphere folding out to give a surface (only kind of though, you need a point at infinity to really match them up).

Of course a ball (filled in sphere) is 3 dimensional because you also need to describe how far each point is from the origin, so 3 coordinates.