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*By definition, to trisect is to divide an angle into 3 parts. Since "0" divided by "3" is "0", you can trisect a 0-degree angle by doing nothing. By analogy, you can divide a 0-degree angle into any number of angles equally by doing nothing. It is also interesting to note that while you can divide it equally into any number of angles, you cannot divide it unequally into various angles. Of course, a zero-degree angle is a essentially a line, so it is sometimes not even considered an angle. Use this at your own discretion.