Results 1 to 6 of 6

Math Help - Trig help

  1. #1
    Junior Member
    Joined
    Apr 2010
    Posts
    40

    Trig help

    In an isosceles triangle the length of each of the two equal sides is 10 cm, and each of the equal angles measures 68 degrees. Find the height of the triangle from one of the two equal sides.
    I tried this and got approximately 9.28cm but the answer according to the sheet is supposed to be 7cm.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member bigwave's Avatar
    Joined
    Nov 2009
    From
    honolulu
    Posts
    580

    Cool

    Quote Originally Posted by sinjid9 View Post
    In an isosceles triangle the length of each of the two equal sides is 10 cm, and each of the equal angles measures 68 degrees. Find the height of the triangle from one of the two equal sides.
    I tried this and got approximately 9.28cm but the answer according to the sheet is supposed to be 7cm.
    i got your answer also.

    10\sin{68^o} = 9.27
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Apr 2010
    Posts
    40
    An overpass must clear a highway by 12m. If the approach to the overpass may not exceed 8 degrees, find the minimum length of the approach (along the slope).
    What does a diagram for this question even look like?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor
    Prove It's Avatar
    Joined
    Aug 2008
    Posts
    11,794
    Thanks
    1574
    Quote Originally Posted by sinjid9 View Post
    An overpass must clear a highway by 12m. If the approach to the overpass may not exceed 8 degrees, find the minimum length of the approach (along the slope).
    What does a diagram for this question even look like?
    Your approach needs to be 12\,\textrm{m} above the ground and be at an angle of 8^{\circ}. You can draw a right-angle triangle to show this situation. You need to find the length of the approach, which is the hypotenuse of the triangle.

    Also, post new questions in new threads please.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Junior Member
    Joined
    Apr 2010
    Posts
    40
    If I were to do a let statement for the side, opposite to the angle that is 82 degrees, how would I write it?
    Follow Math Help Forum on Facebook and Google+

  6. #6
    MHF Contributor
    Prove It's Avatar
    Joined
    Aug 2008
    Posts
    11,794
    Thanks
    1574
    Quote Originally Posted by sinjid9 View Post
    If I were to do a let statement for the side, opposite to the angle that is 82 degrees, how would I write it?
    The height of the triangle is the side opposite 8^{\circ}.

    Since you are dealing with the opposite side and trying to find the hypotenuse, you need to use

    \sin{\theta} = \frac{\textrm{Opposite}}{\textrm{Hypotenuse}}.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Compute Trig Function Values, Solve Trig Equation
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: September 8th 2011, 08:00 PM
  2. Trig word problem - solving a trig equation.
    Posted in the Trigonometry Forum
    Replies: 6
    Last Post: March 14th 2011, 08:07 AM
  3. Replies: 7
    Last Post: April 15th 2010, 09:12 PM
  4. Replies: 6
    Last Post: November 20th 2009, 05:27 PM
  5. Replies: 2
    Last Post: April 21st 2006, 04:04 PM

Search Tags


/mathhelpforum @mathhelpforum