The tangent function is a periodic function with period 180 degrees sotan(360) = tan(360-2*180) = tan(0) = 0.
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Of course. Any number of degrees between zero and 360 is a perfectly good measure for an angle.
A circle has 360 degrees inside it, 360/3=120. Cut the circle up so that there are three 120 degree angled wedges and you have 3 equal parts.
A square, four equal sides with four equal 90 degree corners. 90 + 90 + 90 + 90 = 360 TRUE HAHA LOL
One degree could be equal to any length depending on how far from the point of origin you are making a measurement. It is not normally a function of length. One degree can be broken down into 60 minutes or 360 seconds.