1. The problem statement, all variables and given/known data Here's a screen shot of the problem statement: http://i.imgur.com/IRI02Ne.png For the purpose of this post, I'll label the given information as: a = left side of ladder (2.5m) a' = distance from floor to the point where the man is standing (2.0m) b = right side of ladder (2.5m) c = distance between the feet of the ladder (1.8m) m = mass of man (78kg) T = force of tension on the horizontal support of the ladder T_A = torque on the left foot of the ladder T_B = torque on the right foot of the ladder T_C = torque on the hinge of the ladder N_l = normal force of the ground against the left foot of the ladder N_r = normal force of the ground against the right foot of the ladder N_man = normal force of the step against the man Using the law of cosines, I found: angles A and B = 68.9 degrees angle C = 42.2 degrees I know FBD must be drawn for each side of the ladder I know that N_man = mg I know that T = the horizontal component of mg I know that net torque = 0 and net forces are 0 also I'm having a really hard time mapping out where all the forces are and where equilibrium actually exists...even after looking at similar post like this one: https://www.physicsforums.com/threads/triangle-ladder-equilibrium-problem.796257/ I'm really disappointed that I can't figure this out even though there's all this information. 2. Relevant equations net torque = 0 net forces = 0 3. The attempt at a solution Here's a terrible FBD of the left hand side: https://sketch.io/render/sketch55467fe4bc86c.png T_A = r x F = a' * cos(68.9) x (78)(9.8) = 550.3 N T_C = r x F = 0.5 * sin(C/2) x (78)(9.8) = 137.6 N T_B = ... (this part doesn't make sense to me) I'm so frustrated and confused at this point. Where is the force `R` coming from in the similar post I linked to?! Why does N_l exist if mg is canceled out by N_man?!