Thread: math help.. confused

A quadrilateral has vertices A (1, 1), B(3. 4), C(6, 2) and D(4, -1). How do I show that the DIAGONALS are perpendicular to each other.

Originally Posted by matty

A quadrilateral has vertices A (1, 1), B(3. 4), C(6, 2) and D(4, -1). How do I show that the DIAGONALS are perpendicular to each other.

Matty, I answered this type of question in another one of your posts. In order to tell if two lines are perpendicular, check to see if the product of their slopes is -1.

Find the slope of AC and BD. Multiply them together. Is the answer -1?