Equation of a circle passing through three points $(1,3),(-1,2),(2,1)$
14520
Get the equation of a circle when given 3 points
144978
Find the differential equation of all circles of radius a
60811
How to find the equation of a line, tangent to a circle, that passes through a given external point
144901
Tangent to a circle through a point
101434
To find tangents to given circle from a point outside it
86640
Equation of a line that is tangent to a curve at point
4704
How to find an ellipse , given 2 passing points and the tangents at them?
115808
The normal equation of the plane that contains the line $(1,1,1) + t(-2,0,3)$
28594
Number of integer solutions of the following equation
158210
showing $\arctan(\frac{2}{3}) = \frac{1}{2} \arctan(\frac{12}{5})$
53152
Find a circle's radius with three known tangent lines
40650
Equation for testing if a point is inside a circle
70290
Parametric Equation of a Circle in 3D Space?
70548
Equation of straight line with given points
69203
Calculus proof for the area of a circle
12158
Show that $\arctan\frac{1}{2}+\arctan\frac{1}{3}=\frac{\pi}{4}$
76001
Construct a fourth circle tangent to 3 circles forming a tangency chain