Is a zero degree angle really an angle? If an angle is formed by two rays starting at the same point, then a zero degree angle really has only one ray; so it is a degenerate angle. Your question is almost like asking, "What is the smallest number greater than zero?" No matter what answer you give, I can give you a number smaller than your number.
25o
20
20 degrees
100/2 = 50; 50/2 = 25o
the answer is twice. the angle of rotation is twice the measure
25o
20
20 degrees.
15 degrees
20 degrees
20 degree.
25 degrees
100/2 = 50; 50/2 = 25o
angle with smallest measure - apex
The angle with the smallest measure is opposite the shortest side. Similarly, the angle with the largest measure is opposite the longest side.
54 degrees
the answer is twice. the angle of rotation is twice the measure