It is obvious from the coordinates that, if A = (-1, -1), B = (3, -1) and C = (-1, 2) thenAB is horizontal and of length 4
AC is vertical and of length 3
So ABC is right angled with legs of length 3 and 4 and so with an area of 6 square units.
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Two sides of a triangle are not enough to determine its shape and so it is impossible to find its area.
The area of triangle is : 60.0
The area of triangle is : 12.0
The area of triangle is : 12.0
The area of triangle is : 210.0