Question 895043
{{{drawing(300,300,-2,10,-2,10,grid(1),circle(5,-1,0.25),circle(7,4,0.25),circle(7,8,0.25),
blue(line(5,-1,7,4)),blue(line(7,4,7,8)))}}}
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To get to D, move 4 units up from A, just like from B to C.
(5,-1)+(0,4)=(5,3)
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{{{drawing(300,300,-2,10,-2,10,grid(1),circle(5,3,0.25),circle(5,-1,0.25),circle(7,4,0.25),circle(7,8,0.25),blue(line(5,-1,5,3)),blue(line(5,3,7,8)),
blue(line(5,-1,7,4)),blue(line(7,4,7,8)))}}}