Prove that centroid of triangles and concide. | Demostrar que baricentro de los triángulos y concide. |
If there are 2 vectors that their endpoints concide we can omit them and replace them with their sum (If their sum is nonzero). | Si hay 2 vectores que sus extremos concide podemos omitir a ellos y reemplazarlos con su suma (si su suma es cero). |
