part A) check the picture below.
part B)
hmmm, between 0 and 2 radians I take it, it means.

so... 11π/2 is really just going around the circle 5 times, and then adding π/2, now, these are positive angles btw, so we're going counter-clockwise.
so.. where would that land you at? well at π/2, since going around the circle once will land you back at 0, and doing it 5 times lands you back at 0 5 times, and then you add the extra π/2.
now, is π/2 a coterminal angle between 0 and 2 radians? well,

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