Question: what is the difference between degrees radians and grads?
Answer: 1/360 of a circle is defined as 1  called "one degree." 1/60 of a degree is 1 minute, and 1/60 of a minute is 1 second of angle. 1/400 of a circle is defined as 1 grad. One radian of angle is the central angle in any circle which opposite arc is equal to the radius of that circle.