Question

find the value of m if the points (5, 1), (–2, –3) and (8, 2m ) are collinear.

Answer 1

o find the area of quadrilateral ABCD, we draw one diagonal, say AC.

Accordingly, area (ABCD) = area (ΔABC) + area (ΔACD)

We know that the area of a triangle whose vertices are (x1, y1), (x2, y2), and (x3, y3) is  

Therefore, area of ΔABC