Vertices of the triangle:
J (-2,1), K (4,3), and L (-2,-5)
Area of triangle: 18
or
determinant=
4,3,1
-2,1,1
-2,-5,1
determinant= 4(1+5)-3(-2+2)+1(10+2) = 36
A = determinant/2
36/2=18
Notice that one side is vertical. Use that side as base.
Area is 18.
