GeoDom

In a cyclic quadrilateral $ABCD$, let $a$, $b$, $c$, $d$ denote the lengths of sides $AB$, $BC$, $CD$, $DA$, and $m$, $n$ the lengths of the...

Let $\triangle{ABC}$ be a triangle. Let $AD$ be the angle bisector of $\angle{BAC}$ in $\triangle{ABC}$. Let $d$ be the length of $AD$. Then...

En arXiv (Cornell) A Unified Substitution Method for Integration  En  Mathematics Magazine A Generalization of the Law of Tangents . En  The...

I've been trying to rescue the Half-Angle Formulas  from oblivion and give them the status they deserve by showing its many applications...

If you are already familiar with Bretschneider's Formula, have you ever wonder how would it like if we interchange the cosine-part by a ...

La mayoría de nosotros, enfrentados ante un problema matemático de esos de “cuánto tardarían dos trenes en chocar si uno sale de la estación...

Consider a triangle $\triangle{ABC}$ and its Incenter, $I$. Denote $R$ and $r$ the circumradius and inradius, respectively. Also let $AI=k$;...