In parallelogram ABCD, A = (3,4), B = (1,3), C = (5,1), and D = (7, 2). Find the area of the parallelogram.

For the longer side, I used the Pythagorean theorem and found the length was 2 root 5. I tried to find the height of the parallelogram but, I can't use the Pythagorean theorem because it's not the side it's the height. I was wondering if you could explain this pls.

Guest May 22, 2021