Results 1 to 5 of 5

Math Help - trig homework, please help!

  1. #1
    Newbie
    Joined
    May 2008
    From
    New York
    Posts
    19

    Cool trig homework, please help!

    From a point level ground, the angle of elevationn of the top of an 85 pole is 62 degrees. Find, to the nearest integer the distance from that point to the foot of the pole.

    A 40 foot long wire stretches from the top of a vertical pole to a stake in the ground 18 feet from the foots of the pole. Find, to the nearest degree the measure of the acute angle that the wire makes with the ground.


    Thanks! and any tips would also be helpful!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor Reckoner's Avatar
    Joined
    May 2008
    From
    Baltimore, MD (USA)
    Posts
    1,024
    Thanks
    75
    Awards
    1

    Smile

    Quote Originally Posted by Laura901 View Post
    From a point level ground, the angle of elevationn of the top of an 85 pole is 62 degrees. Find, to the nearest integer the distance from that point to the foot of the pole.
    Did you draw a picture? Remember that \tan\theta = \frac{\text{opposite side}}{\text{adjacent side}}. If you substitute the appropriate values, you should have an equation that you can solve for the distance.

    Quote Originally Posted by Laura901 View Post
    A 40 foot long wire stretches from the top of a vertical pole to a stake in the ground 18 feet from the foots of the pole. Find, to the nearest degree the measure of the acute angle that the wire makes with the ground.
    Again, draw a picture. Take the cosine of the angle and set it equal to \frac{\text{adjacent side}}{\text{hypotenuse}} to form an equation. Then solve for that angle using \arccos.

    Does that help? If you get stuck, post the work you have done so far.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    May 2008
    Posts
    186
    I don't think they teach arccos at the level of the question.

    In case you're wondering, arccos = cos^-1. It should be the second function on the cos button of your calculator.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor Reckoner's Avatar
    Joined
    May 2008
    From
    Baltimore, MD (USA)
    Posts
    1,024
    Thanks
    75
    Awards
    1

    Smile

    Quote Originally Posted by sean.1986 View Post
    I don't think they teach arccos at the level of the question.
    How else would you solve it? I should think such a question would presuppose knowledge of the inverse trigonometric functions, and any good instructor should mention both notations. I write it as arccos because there is no danger of it being confused with a reciprocal.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Member
    Joined
    May 2008
    Posts
    186
    I agree it should be taught, but I was just clarifying for the OP in case she didn't know.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Help with Trig. homework please
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: January 24th 2010, 01:25 PM
  2. Trig homework
    Posted in the Trigonometry Forum
    Replies: 0
    Last Post: December 1st 2008, 10:21 AM
  3. Trig homework
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: December 1st 2008, 04:41 AM
  4. trig homework
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: August 8th 2008, 09:09 AM
  5. Trig/cal homework help
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: March 22nd 2007, 04:09 PM

Search Tags


/mathhelpforum @mathhelpforum