calculate570 degree

[anaseer]

I need help to solve this problem
calculate sin 570 without using calculator

I know 360= 2 pi and 180 = pi

I set

(570 - 360 )=210

sin 210 I dont the value of 210
How do I find the value on 210?

 

[tkhunny]

"Reference Angle"

210 = 180 + 30

 

[anaseer]

210 = pi + pi/6
= 7pi/6
is that right or do i have to add 2pi also

 

[Aladdin]

210 = pi + pi/6
= 7pi/6
is that right or do i have to add 2pi also

What's, sin(pi +alpha) ~

 

[anaseer]

I check all my book but I couldn't find
What's, sin(pi +alpha) ~

 

[tkhunny]

Did you look up "Reference Angle"? What sin(30º)?