On Wed, 9 Dec 2020, Otared Kavian wrote:
> Thanks a lot ! Indeed that does the job, which shows how wonderful Metafun is
> !
Or, if you want to use high school algebra:
\starttext
\startMPcode
z1 = (1cm,3cm) ;
z2 = (5cm, 9cm) ;
z3 = 1cm * dir(angle (z2 - z1)) shifted z2;
draw z1 -- z3 ;
draw z1 -- z2 withcolor red;
\stopMPcode
\stoptext
Aditya
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