Tangents are not real

A line that intersects only one point on a circle so that a perpendicular line could be made off that point is not possible, because the line would hit an infinite number of points on the circle before reaching just one point on the edge of the circle.  Sure you can specify one point on a circle, but the line is touching infinitely more than just one point as well as that single point.  Touch one point on a triangle, sure.  Circle, no.

>>7,8,10,11
A point is "dimensionless without any properties except location" according to Dictionary.com. Although it is dimensionless, it cannot be '0D' because, as >>11 said, it would not able to exist.
This brings me back to the POINT (haha) I was trying to make in >>5: A 'point' in mathmatics is as large or small as the viewer percieves it, because a point is undefined and CANNOT be defined until we revise math as we know it.