6.(iii) Name the type of quadrilateral formed, if any, by the following points, and give reasons for your answer:
(4, 5), (7, 6), (4, 3), (1, 2)
Let the given points be representing the vertices A, B, C, and D of the given quadrilateral respectively.
The distance formula:
And the diagonals:
Here we can observe that the opposite sides of this quadrilateral are of the same length.
However, the diagonals are of different lengths.
Therefore, the given points are the vertices of a parallelogram.