We want to join by a line two distinct points $A$ and $B$. We have only a ruler of length $l>0$ and a pen. If $AB>l$ how can we do this? Imagine a method that works when $AB$ is really huge and we cannot draw a line close to $B$.
$\begingroup$
$\endgroup$
22
-
4$\begingroup$ It can be done using the Desargues theorem. Is the reason of the downvotes the fact that it is not exactly research level? $\endgroup$– Daniel SoltészCommented Nov 30, 2014 at 19:53
-
4$\begingroup$ @DanielSoltész I've also posted the question on stackexchange but I am not satisfied with the solution posted there. I hope you can give me some advice. Thanks a lot! Here it is math.stackexchange.com/questions/1042541/how-can-we-draw-a-line $\endgroup$– BogdanCommented Nov 30, 2014 at 22:00
-
11$\begingroup$ @Bogdan: You might have mentioned sooner that the question had already been posted on math.SE. $\endgroup$– Pete L. ClarkCommented Nov 30, 2014 at 22:10
-
6$\begingroup$ @Bogdan, why are you not satisfied with that solution? It seems fine to me. $\endgroup$– Noah SchweberCommented Dec 1, 2014 at 3:27
-
5$\begingroup$ This question appears to be a cross-post of an answered question (answerer on math.SE is responsive too). $\endgroup$– user9072Commented Dec 1, 2014 at 13:46
|
Show 17 more comments