Ik had m'n vraag al op een Engelstalig forum gesteld dus hij staat hier ook in het Engels, in het Nederlands reageren mag altijd.
Let . Find the equation of (through the origin) such that . Also, make a geometric construction.
What I did was the following:
Since is a line through the origin it has to be of the form where we need to find . Now, the cross ratio has only been defined as far as I know for points. Hence, let and then the cross ratio is defined as
If I did the right computation I find:
My question: is the above correct? Secondly, what about the geometric construction? Geometrically, I know what the cross ratio mean though I have no idea what to do here. Anyone?
Thanks in advance!
Veranderd door Prot, 23 juni 2013 - 22:05