Results 1 to 5 of 5

Math Help - i just carnt get the trig answers.....

  1. #1
    Newbie
    Joined
    Jun 2008
    Posts
    5

    i just carnt get the trig answers.....


    a. Find the area of a triangle in which A=60degrees, b=182.5cm,c=160cm .

    b. Calculate the area of a regular fifteen-sided figure inscribed in a circle of radius 10cm.

    plz help thank you for any help.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor Mathstud28's Avatar
    Joined
    Mar 2008
    From
    Pennsylvania
    Posts
    3,641
    Quote Originally Posted by Steven H View Post
    a. Find the area of a triangle in which A=60degrees, b=182.5cm,c=160cm .

    b. Calculate the area of a regular fifteen-sided figure inscribed in a circle of radius 10cm.

    plz help thank you for any help.
    For the first one you can use trigonometry to find the height of your triangle and proceed to find area the normal way A_{triangle}=\frac{1}{2}bh

    For the second one do you know the formula

    A_{\text{regular n-gon}}=\frac{1}{2}\alpha{p}
    where p is the perimiter and alpha is the apothem?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Jun 2008
    Posts
    5
    Quote Originally Posted by Mathstud28 View Post
    For the first one you can use trigonometry to find the height of your triangle and proceed to find area the normal way A_{triangle}=\frac{1}{2}bh

    For the second one do you know the formula

    A_{\text{regular n-gon}}=\frac{1}{2}\alpha{p}
    where p is the perimiter and alpha is the apothem?
    im not sure how to do any of it to be truth full especially the second equation any other pointers i would be greatful for any other tips.
    thank you very much.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor Mathstud28's Avatar
    Joined
    Mar 2008
    From
    Pennsylvania
    Posts
    3,641
    Quote Originally Posted by Steven H View Post
    im not sure how to do any of it to be truth full especially the second equation any other pointers i would be greatful for any other tips.
    thank you very much.
    My advice for the first one would be to draw the picture, from there I think you will be able to see what you need to do,

    For the second one the apothem is more of a visual concept, so look here and see if you can glean how to do it from that. If not post back

    Apothem - Wikipedia, the free encyclopedia
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Jun 2008
    Posts
    5
    Quote Originally Posted by Mathstud28 View Post
    My advice for the first one would be to draw the picture, from there I think you will be able to see what you need to do,

    For the second one the apothem is more of a visual concept, so look here and see if you can glean how to do it from that. If not post back

    Apothem - Wikipedia, the free encyclopedia
    thanks for your tips i think the scary thing is the 15 sides it seems a lot of sides.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Did I get the right answers?
    Posted in the Algebra Forum
    Replies: 1
    Last Post: April 6th 2010, 11:53 PM
  2. Not sure of answers
    Posted in the Calculus Forum
    Replies: 3
    Last Post: November 8th 2009, 05:03 PM
  3. Trig Help ( verify answers)
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: February 18th 2009, 07:31 AM
  4. anyone know the answers to these?
    Posted in the Math Topics Forum
    Replies: 12
    Last Post: January 23rd 2008, 10:29 AM
  5. Help Checking Answers for Trig Expression.
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: April 7th 2007, 10:36 AM

Search Tags


/mathhelpforum @mathhelpforum