Find the area of the quadrilateral whose vertices are at
 
\((-3,0)\), \((-8,6)\), \((-1,-2)\), and \((-6,-2)\).
 
Answer:
 
The vertices taken in order are:
 
x1,y1=-3,0,x2,y2=i,i,x3,y3=i,i,x4,y4=i,i
 
Area of the quadrilateral \(=\)  \(sq. \ units\).