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Alfred565

  • one year ago

What is the sine of a 30° angle?

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  1. anonymous
    • one year ago
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    you need a nice trig cheat sheet

  2. anonymous
    • one year ago
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    find the coordinates of the point corresponding to the 30 degree angle the first coordinate is cosine, the second coordinate is sine

  3. Alfred565
    • one year ago
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    so, 3/2?

  4. Alfred565
    • one year ago
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    @satellite73 and why is the 30 and 60 the same? is it 1/2 or 2/3?

  5. Alfred565
    • one year ago
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    3/2*

  6. UsukiDoll
    • one year ago
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    my professor told me that to find sin30 we have to look at the 30 degree angle.. and use opposite/ hypotenuse

  7. UsukiDoll
    • one year ago
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    |dw:1434591073159:dw| this is a standard 30 degree and 60 degree triangle

  8. UsukiDoll
    • one year ago
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    so to look for sin 30 I have to go opposite/hypotenuse so it's like drawing a line from the 1 first and then to the 2 |dw:1434591150637:dw|

  9. UsukiDoll
    • one year ago
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    sin x = opposite/hypotenuse so my opposite value is 1 and my hypotenuse is 2.. so sin 30 = 1/2

  10. UsukiDoll
    • one year ago
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    but to go for 60 degrees I have to START at the 60 degree angle.

  11. UsukiDoll
    • one year ago
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    |dw:1434591242435:dw|

  12. UsukiDoll
    • one year ago
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    |dw:1434591275310:dw| so opposite/hypotenuse for 60 degrees is \[\frac{\sqrt{3}}{2}\]

  13. UsukiDoll
    • one year ago
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    the value for triangle is the same but you have to go in a different direction if you want sin 60

  14. anonymous
    • one year ago
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    Just a head up. I would learn the Unit circle. It will come in handy later on in your studies.

  15. UsukiDoll
    • one year ago
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    luckily for 45 degrees it's easier

  16. UsukiDoll
    • one year ago
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    because 45 degrees is everywhere... and the values are the same.. except tan 45 is always 1

  17. UsukiDoll
    • one year ago
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    |dw:1434591444328:dw|

  18. UsukiDoll
    • one year ago
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    you need to memorize these triangles... they are super useful for calculus....especially when you're not allowed to use a calculator in exams.

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