iheartfood
sin(3pi/4)=_____
(answer choices attached inside!)
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Hero
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Where are the attachments?
iheartfood
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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
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Are you familiar with the unit circle?
iheartfood
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yes.. its a circle with the radius of 1 right?
Hero
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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
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That's your hint.
iheartfood
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ok... :)
iheartfood
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and they both equal each other!! So is my answer B. then? :)
Hero
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B is the correct answer, but how did you figure it out?
iheartfood
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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
iheartfood
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thanks :)
Hero
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The only thing you need to figure it out is a unit circle.
\[\sin(135^{\circ}) = \frac{\sqrt{2}}{2}\]
iheartfood
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ok.. thanks :)