30 degrees
270 degrees
120 degrees and 240 degrees.
It is a obtuse angle.
get yourself a cartesian circle, or just look at one online and translate it from there 3,6,9, and 12 would all be 90 deg increments.
At 3 hours 45 minutes there is not an acute angle between the hands of the clock (unless you extend the hands backwards).
120degrees
90 degrees
150
30 degrees.
60o
obtuse
180 degrees.