1. The problem statement, all variables and given/known data A mass (m=255kg) hangs from a horizontal ceiling by two cables, one of length 3m and the other 4m. The two cables subtend an angle of 90 degrees at the mass. What is the tension in each cable? 2. Relevant equations F=ma T=ma? 3. The attempt at a solution It's in equilibrium, so the forces sum to zero. F=ma so, 255kg(9.81)? or 255kg(-9.81)? I am confused about the word subtend? I know a chord in a circle subtends the arc... but here..? The lengths of the cables are confusing me, how can the ceiling be horizontal, and the cables make 90 degree angles with the mass, but be different lengths? So I must be interpreting the information wrong and making it harder then it is. Ah!