Prove the curve is a part of circle
65491
if the curvature is constant and positive, then it is on the circunference
154080
circular reasoning in proving $\frac{\sin x}x\to1,x\to0$
97011
Proving that $\prod_{k=1}^{n}\tan\left(\frac{\pi k}{2n+1}\right)=\sqrt{2n+1}$ using geometry
46353
Proof that $\cos(\pi/3)=1/2$
63802
Parametric Equation of a Circle Using a Line
129366
How can I curve a design I made to make it perfectly match the curve of a circle?
26687
Show that $f$ maps the unit circle to itself
66185
condition for curve on a sphere
145509
Prove the roots of $p(z)+z^n\bar{p}(\frac{1}{z})$ lie on the unit circle
37448
Two Circles and Tangents from Their Centers Problem
104548
Geometric proof for irrationality of $\pi$
134722
Intersection of straight line and circle
144713
Simple Calculus Proof
83402
equation of a circle that has a radius of $\sqrt{10}$
24730
A circle has the same center as an ellipse and passes through the foci $F_1$ and $F_2$ of the ellipse, two curves intersect in $4$ points.
111094
Help with proving that $\pi$ is irrational
158217
Volume of neighborhood of the curve