GeoDom

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 $AI=k$;...

Given a general  convex quadrilateral with sides of lengths $a$, $b$, $c$, and $d$, the area is given by $$\begin{align*} K&=\frac{1}{4}...

Renowned British mathematician John Conway , in correspondence with Peter Doyle, used two trigonometric formulae to prove Heron's formul...

"If we do not succeed in solving a mathematical problem, the reason frequently consists in our failure to recognize the more general st...

In this note we derive Heron's formula, Brahmagupta's formula and the bicentric quadrilateral's area formula, $\sqrt{abcd}$, fro...