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anonymous

  • one year ago

Challenge! Ready? Write the ratios for sin A and cos A. The triangle is not drawn to scale. http://assets.openstudy.com/updates/attachments/52f5130ae4b0512c88e57688-javo22-1391792928279-4568452232011112633am1351153605.png

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  1. mathstudent55
    • one year ago
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    Have you heard of SOHCAHTOA?

  2. anonymous
    • one year ago
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    yes

  3. anonymous
    • one year ago
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    Hint: it ends in a decimal

  4. mathstudent55
    • one year ago
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    Use the parts of SOHCAHTOA of the sine and the cosine.

  5. mathstudent55
    • one year ago
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    I hate to tell you this, but it doesn't.

  6. anonymous
    • one year ago
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    Oh?

  7. anonymous
    • one year ago
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    Did I make a mistake then?

  8. DanJS
    • one year ago
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    what is the opposite side of angle A

  9. anonymous
    • one year ago
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    This type of triangle with the 90degrees and the 45degrees is a special type of triangle. Isosceles, i think. This means that the 7 side and the y side are always equal. the 45degrees and the unlabeled angle are the same, because the angles of the triangle add to 180. so, 180 - 90 -45 = 45. the unknown angle is 45degrees. Which also proves that the sides, 7 and y are the same length. Then to find x, you can use Pathagorean's theorem. (spelling?) ... which says C2=A2+B2 where C is the hypotenuse (across from the right angle), and A and B are the other sides. So, for your problem, x2=72+72=49+49=98 x=98−−√

  10. DanJS
    • one year ago
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    an isosceles triangle has two sides of the same length, this one does not

  11. anonymous
    • one year ago
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    Then Using SOHCAHTOA hypotenuse = opposite / sin x = 7 / sin45 x = 9.9 adjacent = opposite / tan y = 7 / tan45 y = 7 Or using Pythagoras Theorem. A right angle triangle with two 45 degree angles means that two sides are the same. Therefore y also equals 7. a^2 = b^2 + c^2 where a is the hypotenuse. x^2 = 7^2 + 7^2 x^2 = 49 + 49 x^2 = 98 x = 9.9

  12. anonymous
    • one year ago
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    I am redeeming myself....I guess I did it wrong sorry guys.

  13. DanJS
    • one year ago
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    For a right triangle, the sin of the angle is the ratio of the opposite side divided by the hypotenuse side lengths

  14. DanJS
    • one year ago
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    the sin of A would simply be 48/50

  15. anonymous
    • one year ago
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    I see

  16. anonymous
    • one year ago
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    I should have set up another challenge

  17. anonymous
    • one year ago
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    I messed up, why???

  18. DanJS
    • one year ago
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    oh, you are trying to challenge the panel maybe?, so you already know these things then

  19. anonymous
    • one year ago
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    Yup.

  20. DanJS
    • one year ago
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    oh, this is my fault, sorry

  21. DanJS
    • one year ago
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    they need a new tab section, for these type questions

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