sin(3pi/4)=_____

(answer choices attached inside!)

Question

sin(3pi/4)=_____

(answer choices attached inside!)

hero · Answer

Where are the attachments?

anonymous · Answer

sorry right here haha :P

answer choceis A,B,C,D from top to bottom :)

**my answer: B. sq.rt 2/2

is that right? :)

hero · Answer

Are you familiar with the unit circle?

anonymous · Answer

yes.. its a circle with the radius of 1 right?

hero · Answer

Yes, but we have to figure out the exact value. So, what I would do is convert radians to degrees first. If you let pi = 180, then you will have:

sin(3(180)/4) = sin(3(45))

hero · Answer

That's your hint.

anonymous · Answer

ok... :)

anonymous · Answer

and they both equal each other!! So is my answer B. then? :)

hero · Answer

B is the correct answer, but how did you figure it out?

anonymous · Answer

well i used ur hint and plugged it into my calc and they both had .088 as the result 

and laso b4 that, i did sin3pi/4and i just converted it :) hehe

anonymous · Answer

thanks :)

hero · Answer

The only thing you need to figure it out is a unit circle. 
$$\sin(135^{\circ}) = \frac{\sqrt{2}}{2}$$

anonymous · Answer

ok.. thanks :)