this isn't really a homework question but this seems the most appropriate area since i feel the mechanics involved is fairly simple.
i was absent mindedly considering a seesaw with two equal masses at either end of a massless arm and the fulcrum in the middle of the arm.
in this scenario if...
i would like to know if the 'angle' between let's say the walls of a room (ie. the intersection of 3 planes all perpendicular to each other) can be represented in mathematical terms, but as a kind of 3D angle- that is to say not as a combination of 2D angles but as an altogether new form of...