mechanics concept

A triangular plate is hung such that it is in the horizontal plane..we use 3 threads and tie them to one of the vertices each and the other to the roof let the tensions be T1,T2,T3 and the lengths of the sides opposite to the tensions b l1,l2,l3
Note: the strings are perpendiclar to the horizontal plane
mas of plate is m
a T1/l1=T2/l2=T3/l3
b T1/l2.l3=T2/l1.l3=T3/l1.l2
c T1=T2=T3=mg/3
d none of these