u = 1cm; beginfig(1); pair A, B, C, M, N; A=(0,0)*u; B=(1.5,2)*u; C=(4,0)*u; N=(1.9,0)*u; M=(0.65,1)*u; draw A--B--C--cycle withpen pencircle scaled 1.5pt; draw (0,1.6)*u for i=0 upto 3 : ..(i,-0.8*i+1.6)*u endfor withpen pencircle scaled 1.5pt; label.lft("A",A); label.rt("C",C); label.top("B",B); label.lft("M",M); label.bot("N",N); endfig; end