Mathematics, 20.01.2021 23:30 lhmsokol56
Matikas is writing a coordinate proof to show that the midpoints of a quadrilateral are the vertices of a parallelogram. He starts by assigning coordinates to the vertices of quadrilateral RSTV
and labeling the midpoints of the sides of the quadrilateral as A, B, C, and D.
Quadrilateral R S T V in a coordinate plane with vertex R at 0 comma 0, vertex S in the first quadrant at 2 a comma 2b, vertex T also in the first quadrant at 2 c comma 2 d, and vertex V on the positive side of the x-axis at 2 c comma 0. Point A is between points R and S, point B is between points S and T, point C is between points T and V, and point D is between points R and V.
Enter the answers, in simplified form, by filling in the boxes to complete the proof.
The coordinates of point A are (
,
).
The coordinates of point B are (a+c, b+d)
.
The coordinates of point C are (
,
).
The coordinates of point D are (c, 0)
.
The slope of both AB¯¯¯¯¯
and DC¯¯¯¯¯ is dc
.
The slope of both AD¯¯¯¯¯
and BC¯¯¯¯¯ is
.
Because both pairs of opposite sides are parallel, quadrilateral ABCD
is a parallelogram.
Answers: 2
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