Asked by Joe

I need help with this.. it's for my midterm review. My midterm is next week. I would appreciate the help.

Determine two coterminal angles (one positive and one negative) for each angle. The answer must be in degrees.

a) 36 degrees
b) -120 degrees
c) 300 degrees
d) -420 degrees
Answered by Reiny
adding or subtracting multiples of 360º to any angle will result in the rotating arm ending in the same position, thus giving you "coterminal" angles

so 36º + 360º = 396º
36 - 360 = -324

so that to each of your angles.
(for -420 you will have to add 720 to obtain a positive result)
Answered by Joe
Thx! I really do understand it now. What if they give me like pi/9.... How do i find two coterminal angles (one positive and one negative) in RADIANS.
Answered by Damon
360 degrees is 2 pi radians so adding or subtracting 2 pi (or a multiple of 2 pi) to an angle in radians brings you to the same place.
Answered by renztane
-120 degree
Answered by renztane
480 degre
Answered by Neko
how do i get a coterminal angle from something like pi/6 ????????
Answered by luis
820
Answered by Vipul
I need help on coterminals, I have NO! idea on how to do it
Answered by Jon
so I have the conterminal angle of 111 degree. So do I add and subtract with 360 degree or 180 degree?
Answered by astro boy
lol this was one of my final questions for trig/precal
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