Locus of a point where two circles having a common tangent meets
64588
Circle and Locus _ ONLY PEN AND PAPER ALLOWED.
153767
Singular points and tangent lines
62228
The portion of the tangent to any conic intercepted between the point of contact and the directrix subtends a right angle at the focus of the conic?
32090
Equal intersection segments on circles
53861
N points on a Circle
85111
Move a rectangle along the tangent of a circle point
133264
Constructing a circle through a given point, tangent to a given line, and tangent to a given circle
147206
Find a unit tangent vector to a curve that is an intersection of two surfaces.
39416
The space obtained by identifying the antipodal points of a circle
44887
The intersection of two parallel lines
56151
Mental estimate for tangent of an angle (from $0$ to $90$ degrees)
143259
Find the condition on $a$ and $b$ so that the two tangents drawn to the parabola $y^2=4ax$ from a point are normals to the parabola $x^2=4by$
63074
The equation of a family of circles passing through two given points
147149
Intersection of two arcs on sphere
49845
For an ellipse with minor radius $b$, show that the product of distances from the foci to any tangent line is $b^2$
59431
slope of a line tangent through a point
143525
line segment joining two centers of circles is perpendicular to line segment joining two intersection point of the circles