Question

can we have a triangle of area 0 square units ? what does this mean?​

Answer 1

noooooooooooo oooooooo if the area is 0 then the vertices are in collinear

Answer 2

no we can't have so

If the area of triangle is 0 sq units then the vertices of triangle are collinear

i.e.

x1(y2-y3) + x2(y3-y1) + x3(y1-y2) =0