... since a circle is 360o therefore 360/30 = 12
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Starting at a given point, angles of 12 degrees would divide a circle into 30 equal angles. You would have 30 lines radiating out from one point, equally spaced.
An angle that is coterminal with 30 degrees can be found by adding or subtracting multiples of 360 degrees. In this case, an angle coterminal with 30 degrees could be 390 degrees (30 + 360) or -330 degrees (30 - 360). Coterminal angles have the same initial and terminal sides, but may differ in number of rotations around the unit circle.
Any angle between 0 and 360 degrees (except 180 degrees!).
Complementary angles add up to 90 degrees. So, 90 - 30 = 60. The complement of 30 degrees is 60 degrees. Supplementary angles have a sum (add up to) 180 degrees.
Any angle can be coterminal.