Question 1137256
({{{1}}},{{{4}}}),  ({{{4}}},{{{4}}}),  ({{{5}}},{{{1}}}),  ({{{2}}},{{{1}}})

plot points

{{{drawing( 600, 600, -10, 10, -10, 10,
circle(1,4,.12),locate(1,4,p(1,4)),
circle(4,4,.12),locate(4,4,p(4,4)),
circle(5,1,.12),locate(5,1,p(5,1)),
circle(2,1,.12),locate(2,1,p(2,1)),
line(1,4,4,4),line(1,4,2,1),line(5,1,4,4),line(2,1,5,1),

 graph( 600, 600, -10, 10, -10, 10, 0)) }}}

answer: quadrilateral is a parallelogram, opposite sides are parallel and equal in length