Find the area of Triangle ABC if its vertices are A(1,-2,2), B(1,0,1) and C(2,-1,0).

Question

Find the area of Triangle ABC if its vertices are A(1,-2,2), B(1,0,1) and C(2,-1,0).

Answer 1

Find the lengths of three sides.  Calculate semiperimeter s = ½(a+b+c). Then use Heron's formula.