20 August

Not done with angles. Trig is a bit of a trick, the sin, cos and tan we learn at school are really just ratios of lengths, they can help you measure lengths and deviations, but they don't actually tell you anything about the angles themselves that generate the deviation in the first place. Angles can't be defined, we can only measure the deviations they cause. The angle is the cause of all things. Pure deviation, undefinable.