Results 1 to 4 of 4

Math Help - Trig Math Help

  1. #1
    Newbie
    Joined
    Nov 2008
    Posts
    2

    Trig Math Help

    How would someone begin to figure a question like this out? If anyone can help me solve this problem it would be greatly appreciated.
    Attached Thumbnails Attached Thumbnails Trig Math Help-scan0008.jpg  
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member 11rdc11's Avatar
    Joined
    Jul 2007
    From
    New Orleans
    Posts
    894
    Quote Originally Posted by gg_gone View Post
    How would someone begin to figure a question like this out? If anyone can help me solve this problem it would be greatly appreciated.
    \sin{30} = \frac{30}{BC}

    \tan{30} = \frac{30}{BA}

    \sin{52} = \frac{30}{BD}

    \tan{52} = \frac{30}{AD}
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Senior Member pacman's Avatar
    Joined
    Jul 2009
    Posts
    448
    angle BDA = 180 - 128 = 52 degrees

    tan BCD = tan 30 = 30/AC = 30/(AD + CD) ---- (1)

    tan BDA = tan 52 = 30/AD ---- (2)

    from (1)

    (AD + CD) = 30/tan 30,

    AD = 30/tan 30 - CD ---- (3)

    from (2)

    AD = 30/ tan52 ---- (4)

    equate equation (3) and (4)

    30/tan 30 - CD = 30/ tan 52,

    solving for CD, we have

    CD = 30/tan 30 - 30/ tan 52

    CD = 28.52 m

    then AD = 30/ tan52 = 23.44 m

    A) Area of ABC,

    AC = AD + CD

    AC = 23.44 + 28.52 = 51.96 m

    BC = [(30)^2 + (51.96)^2)]^(1/2) = 60 m

    Area = (1/2)(AB)(AC)

    = (1/2)(30)(51.96) = 779.4 m^2

    Perimeter = AB + AC + BC

    = 30 + 51.96 + 60 = 141.96 m


    You solve the rest, ok
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Senior Member pacman's Avatar
    Joined
    Jul 2009
    Posts
    448
    gg_gone, where are you?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Trig Identity math question.
    Posted in the Trigonometry Forum
    Replies: 8
    Last Post: July 11th 2010, 06:19 PM
  2. SAT II Math trig help
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: May 31st 2010, 02:10 PM
  3. help with math modeling: trig horizontal shift
    Posted in the Trigonometry Forum
    Replies: 0
    Last Post: April 19th 2010, 05:52 PM
  4. Math Trig. Help!
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: September 9th 2008, 10:50 AM
  5. 2 Math Question Involving Inverse Trig
    Posted in the Calculus Forum
    Replies: 12
    Last Post: September 24th 2007, 10:08 AM

Search Tags


/mathhelpforum @mathhelpforum