what is the difference between degrees, radians and grads
1 degree = 1/360 of a circle 1 radian = 1/(2pi) of a circle 1 gradient = 1/400 of a circle (and is much less used than the others) Degrees and gradients are arbitrarily chosen using convenient divisors (360 and 400). 1 radian = the angle created when the radius of a circle is laid out along the circumference.