Question

@precal

problem posted in picture

Answer 1

11 pi over 12 is how many degrees?

Answer 2

2.88?

Answer 3

165

Answer 4

no that is radian

Answer 5

its 2.88(pi/180) = 165 correct?

Answer 6

pi is 180 degrees
11pi over 12 is 11 times 180=1980 divided by 12=165 degrees

Answer 7

actually its 180/pi

Answer 8

alright so we got the same 165 degrees

Answer 9

ok look at your unit circle, can you find two degrees that we can use to add or subtract together to create 165 degrees?

Answer 10

120 and 45

Answer 11

yes we can add those together

Answer 12

oh ok so you just pick two random ones, thats the part i couldnt figure out. i kept looking at examples and didnt understand how they chose the two angles to use

Answer 13

sin(120 + 45)=sin120cos45+cos120sin45
just sub values and evaluate

Answer 14

tell me what you got

Answer 15

im sorry i just dont really understand what you mean for me to do
i just put that in my calculator?

Answer 16

don't you have the unit circle?

Answer 17

ooh yes i do

Answer 18

http://www.mathsisfun.com/geometry/images/circle-unit-304560.gif

Answer 19

ok sub those values