Let the position vector a,b,c and the vectors f,g,h define 3 lines  as r=a+uf,r=b+vg,r=c+wh.Further,let the areas of the s formed by the position vectors,the vectors and the lines be _{^1 ,  2,  3.}  FIND the value of-

 ₁square+₂square₊₃square.(Note:u,v and w are non-zero constants and there is a vector arrow over each of a,b,c,f,g and h.)