Question

Find the measures of two angles, one positive and one negative, that are coterminal with pi/6.
13pi/6; -pi/6
pi/6+360 degrees; pi/6-360 degrees
7pi/6; -5pi/6
13pi/6; -11pi/6

Answer 1

@jim_thompson5910

Answer 2

what does coterminal mean?

Answer 3

any ideas?

Answer 4

different angles? @jim_thompson5910

Answer 5

@zepdrix

Answer 6

If two angles are coterminal, then they point in the same direction

Answer 7

for example, 0 degrees and 360 degrees both point directly east

Answer 8

ohh

Answer 9

since 360 degrees = 2pi radians, we just add on 2pi radians to any given angle in radians to get another coterminal angle

Answer 10

or...you could subtract 2pi from the given radian angle to get another coterminal angle

Answer 11

so it would be B? @jim_thompson5910

Answer 12

start off with pi/6 and add on 2pi

Answer 13

you will get ???

Answer 14

450 degrees

Answer 15

we're in radian mode

Answer 16

\[\Large \frac{\pi}{6} + 2\pi = ???\]

Answer 17

13pi/6?

Answer 18

do you see how to get that?

Answer 19

yes

Answer 20

And when I subtracted, I got -11pi/6

Answer 21

very good