For any point outside of a circle, is there ever only one tangent to the circle that passes through the point?
101434
To find tangents to given circle from a point outside it
85111
Move a rectangle along the tangent of a circle point
123426
Find the approximate center of a circle passing through more than three points
71074
The locus of the intersection point of two perpendicular tangents to a given ellipse
124042
Why is a vector space equal to its tangent space for any point?
11017
Does existence of partial derivatives implies continuity at a point $(x_0,y_0)$?
23355
A curve where all tangent lines are concurrent must be straight line
141835
Rigorous Proof: Circle cannot be embedded into the the real line!
56151
Mental estimate for tangent of an angle (from $0$ to $90$ degrees)
5086
Why is the derivative of a circle's area its perimeter (and similarly for spheres)?
143717
Why/How are there infinite points in a line segment?
47906
Can two streamlines in a fluid be tangential to each other not crossing each other?
28898
Is there a function $f: \mathbb R \to \mathbb R$ that has only one point differentiable?
144181
Given an arbitrary set $X$, can one always find an element outside $X$?
110877
Is torque independent of choice of the point of rotation?
19491
How to draw a tangent line to an arbitrary `\addplot`
71128
Is the tangent function (like in trig) and tangent lines the same?