The Purplemath Forums

1) ABCD is a parallelogram and the coordinates of A, B, C are (-8, -11), (1, 2) and (4, 3) respectively. Find the area of the parallelogram. [i]i manage to find that D =( -5.-10) . area of parallelogram = AD x height i'm stuck here. how to find the height? i tried it by finding the angle between AB...

sorry for the late reply. The line AB will be linear; what you have posted is a quadratic. How did you derive this? since i cant find the gradient so i use the distance formula. i let B=(x,y) and D=(a.b) What was your logic for including "2C1"? well, is because there are 2 'O' s. but i thi...