anonymous
  • anonymous
Explain how to find the exact value of Sin 30°
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
.-9880316241 calculator click on sin(30) = .-9880316241
anonymous
  • anonymous
No. I said exact value.
anonymous
  • anonymous
it's probably -1 then

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anonymous
  • anonymous
it's 1/2 but I keep on getting sqrt(3) / 2
anonymous
  • anonymous
it is 1/2
anonymous
  • anonymous
Yes but how do you find it?
anonymous
  • anonymous
look at until circle
anonymous
  • anonymous
actually make a triangle
anonymous
  • anonymous
|dw:1359948962457:dw|
anonymous
  • anonymous
then the sides are sqrt(3) and 1 is hypotunuse
anonymous
  • anonymous
How do you get 1/2?
anonymous
  • anonymous
switch 1 and sqrt(3)
anonymous
  • anonymous
but why?
anonymous
  • anonymous
to get 1/2 that is the triangle of 30 degrees look at this http://www.purplemath.com/modules/trig.htm
anonymous
  • anonymous
OOOOOOOOOH!! thanks!
anonymous
  • anonymous
welcome
anonymous
  • anonymous
memorize unit circle youll need it
anonymous
  • anonymous
I can't memorize stuff
anonymous
  • anonymous
write it out once
anonymous
  • anonymous
look it up on google
anonymous
  • anonymous
my calculator says sin 30 is 0.5
anonymous
  • anonymous
help... how do I find sin120?
anonymous
  • anonymous
sqrt(3)/2
anonymous
  • anonymous
but how? Shouldn't it be the same as sin30?
anonymous
  • anonymous
use unit circle it will make life easy
anonymous
  • anonymous
its a 30 60 90 triangle
anonymous
  • anonymous
no sin of 150 is same as 30
anonymous
  • anonymous
|dw:1359950275904:dw|
anonymous
  • anonymous
s = o / h s = 1 / 2??
anonymous
  • anonymous
http://www.mathsisfun.com/algebra/trig-interactive-unit-circle.html
anonymous
  • anonymous
turn on coordinates
anonymous
  • anonymous
i don't want to memorize... i want to learn how to do it manually :(
anonymous
  • anonymous
what's wrong with my triangle? Is the right angle in the wrong place?
anonymous
  • anonymous
yes it turned upside down
anonymous
  • anonymous
but why? don't you start at 0 degrees? From where do you start?
anonymous
  • anonymous
this site should explain http://www.mathsisfun.com/sine-cosine-tangent.html
anonymous
  • anonymous
OH I GOT IT NOW! Thanks for the site!

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