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(Compiled with Asymptote version 2.14svn-r5318) |
unitsize(1cm); import geometry; dotfactor*=1.5; linemargin=5mm; // currentcoordsys=cartesiansystem((2,1),i=(1,0.5),j=(-1,1)); show(currentcoordsys); point A=(-3,-1), B=(3,4); line l1=line(A,B); draw(l1,red); dot("$A$",A,SE); dot("$B$",B,NW); point M=(2,-2); dot("$M$",M); /* View the definition of line parallel(point,line) */ draw(parallel(M,l1),red); /* View the definition of line perpendicular(point,line) */ line perp=perpendicular(M,l1); draw(perp); /* View the definition of point intersectionpoint(line,line) */ point interp=intersectionpoint(l1,perp); dot(interp,green); /* View the definition of void markrightangle(picture,point,point,point,real,pen,margin,filltype) */ markrightangle(l1.A,interp,rotate(180,interp)*M,size=5mm); draw(box((-5,-5),(5,5)),invisible);