Dani
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 Sep 2 comment Creating a special vector from two vectors Thats working great, thanks. Sep 2 comment Creating a special vector from two vectors @J. M. added an image. Sep 2 comment Creating a special vector from two vectors @J. M. its not perpendicular to them. the vector that connects the two endpoints $\vec {BD}$ is perpendicular to $\vec {AB}$ and same for the other vector. Aug 31 comment Calculating the area of a special hexagon @Glen Wheeler: you are right, I forgot a constraint, see the edit. Aug 31 comment Calculating the area of a special hexagon @Mark Bennet: you are right, I forgot a constraint, see the edit. Jun 13 comment dot product negative angle yes, I've been able it to that. didn't know cross product is such an easy operation. Jun 13 comment dot product negative angle Isn't there an easier way? Apr 14 comment Finding the first term of a geometric series by the sum and $n$ actually by the link Raskolnikov gave its $S = a \cdot \frac{r^{n+1}-1}{r-1}$ because my series terminates in $n$ not $n-1$