A ladder is against a frictionless wall, elevated at angle theta above the ground. I have a question about distance components. We find the torque pushing the ladder to the ground by using horizontal distance components: the distances of the weights acting on the ladder multiplied each by cosine of theta. What is strange is that we use a vertical distance component when finding the force exerted by the wall onto the ladder: distance from the ground to where the ladder touches the wall multiplied by sine of theta. Why don't we use cosine as we did for the others? Sorry if I am unclear, I really don't know how to put it another way.