I don't suppose you made a sketch . . .
| : C
| : o (8,7)
| : :
(-2,1) | : :
A o - - | - * :9
- - - - - + - - - - - - - : - - -
| B o - - - - *
| (2,-2) 6
Since lists the vertices in order,
. . the diagram shows the position of vertex
Going from to , we move right 6, up 9.
Since is parallel to , we must do the same from vertex
Moving "right 6, up 9" from puts us at: .
Compare the slopes of and (b) Determine if parallelogram is a rectangle.
The slopes are not negative reciprocals of each other.
Hence, is not perpendicular to
Therefore, is not a rectangle.