Tuesday, February 24, 2009

Trigs

Trigs is based on ratios of line from a right angle triangle.

Draw the following

sin x = 3/5

cos m = 4/7

tan m = 3/ 4

sin m = 3 / 8

cos x = 5 / 8

tan x = 5 / 7

For each find all the angles and all the lengths
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10 comments:

  1. starFebruary 25, 2009 at 4:17 PM

    first write formula to find angle; sin=opp/hyp
    sin x=3/5
    x=the inverse of sin(3/5)
    x= 36.9 degrees

    length of the adjacent cosx=adj/hyp
    degrees given
    cos36.9degrees=adj/5
    5cos36.9=adj
    therefore adj=4

    ReplyDelete
  2. starFebruary 25, 2009 at 4:23 PM

    first write formula to find angle;cos=adj/hyp
    cosm=4/7
    m=cos inverse 4/7
    m=55.2 degrees

    length of the opposite;sin=opp/hyp
    sin55.2=opp/7
    7sin55.2=opp
    therefore opposite=5.7

    ReplyDelete
  3. starFebruary 25, 2009 at 4:38 PM

    first write formula to find angle;tan=opp/adj
    tan m=3/4
    m=tan inverse 3/4
    m=36.9 degrees

    length of hyp;cos angle=adj/hyp
    cos 36.9=4/hyp
    .8=4/hyp
    hyp(0.8)=4
    hyp=4/0.8
    hyp=5

    ReplyDelete
  4. starFebruary 25, 2009 at 4:45 PM

    First write formula to find angle;sin=opp/hyp
    sin m = 3/8
    m= sin inverse of 3/8
    m= 22 degrees

    length of adj;cos= adj/hyp
    cos 22 =adj/8
    8cos22 = adj
    7.4 = adj

    ReplyDelete
  5. starFebruary 25, 2009 at 4:50 PM

    First write the the formula to find angle;cos=opp/hyp
    cosx=5/8
    x=cos inverse of 5/8
    x= 51.3 degrees

    length of opposite
    sin=opp/hyp
    sin51.3=opp/8
    8sin51.3=opp
    opp =6.2

    ReplyDelete
  6. starFebruary 25, 2009 at 4:58 PM

    First write the formula to find the angle; tan angle=opp/adj
    tanx=5/7
    x= tan inverse 5/7
    x= 35.5 degrees

    length of hyp; sin angle=opp/hyp
    sin35.5=5/hyp
    hyp(0.6)=5
    hyp=5/0.6
    therefore length of hypothenuse=8.33

    ReplyDelete
  7. DarkyFebruary 26, 2009 at 8:21 AM

    sin x = 3/5

    to find the angle sin x = opp/hy
    sin inverse of (3/5)=36.87 degrees


    now that a angle is obtained the lenght can be found the lenght cam be found by saying

    cos x = adj/hyp
    cos 36.87 = adj / 5
    cos 36.87 * 5 = adj
    4.0 is the lenght of the adj side

    ReplyDelete
  8. sky captainFebruary 26, 2009 at 9:03 AM

    i agree with star

    ReplyDelete
  9. sinMarch 1, 2009 at 5:23 PM

    wel you guys beat me to the questions, star i give u ur props daky and captian also, u all know your stuff.
    it was wel layed out and i underestood everything easily, on the bright side i don't have to rack my head on it,lol

    ReplyDelete
  10. AnonymousMarch 3, 2009 at 12:14 PM

    using our knowledge of trigs given the following formulas sinx= o/h cosx= a/h tanx= o/a
    first find the value of the number of times one lenght can go into another and then find the inverse of the given function to find the angle.
    substitute the found angle into the appropriate equations to find the length required.

    ReplyDelete

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