Results 1 to 12 of 12

Math Help - pyramid

  1. #1
    Junior Member
    Joined
    Aug 2007
    Posts
    29

    pyramid

    i need to know the answers and how u got the answers for each of these pages i need to learn this missed lesson
    Attached Thumbnails Attached Thumbnails pyramid-trigo.bmp  
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Junior Member
    Joined
    Aug 2007
    Posts
    29
    ok well question is....

    a golfer plays a shot from t
    the ball travels 120m to p
    the hole (h) is 210m from the tee
    angle HTP is 22degrees

    i need to know distance from p to h
    the angle pht
    and the area of the triangle

    need formulas as to how u do it and answers

    so answer as if its said write your working out
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Aug 2007
    Posts
    29
    heres a link to the work i dont understand need guidance on each question soz missed this total subject

    MyMaths.co.uk - ow13Trigonometry
    Follow Math Help Forum on Facebook and Google+

  4. #4
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by sasha9193 View Post
    the questions you get wont be exactly the same on that link but u can tell me how i do them because only the numbers change not the question
    To the golf problem:

    for the first question, we can use the cosine rule (the Law of Cosines)

    Just so you know:
    t is the side opposite angle T
    p is the side opposite angle P
    h is the side opposite angle H

    we are given p and h and T and we want to find T

    By the cosine rule:
    t^2 = h^2 + p^2 - 2hp \cos T

    use this formula to find t.


    for the second question, we can use the sine rule (the Law of Sines) now that we've found t

    By the sine rule:
    \frac {t}{\sin T} = \frac {h}{\sin H}

    use this formula to solve for H


    for the third question:

    we can use the formula, \mbox { Area } = \frac {1}{2}ph \sin T
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Junior Member
    Joined
    Aug 2007
    Posts
    29
    im not getting the first bit can you rearrange the formula to work it out for me i wanna know how to do that
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Junior Member
    Joined
    Aug 2007
    Posts
    29
    cus i do it but get t still on 1 side and tsquared on the other, can you plz work it out with full calculations that will help me out alot
    Follow Math Help Forum on Facebook and Google+

  7. #7
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    To the Pyramid question:

    see the diagrams below. i drew in some lines and added some figures here. the red lines correspond to the first question, the pink lines correspond to the last question

    first question: the told us E is above the midpoint, so if we drew in lines that cut the midpoint of AB at 90 degrees and the midpoint of BC at 90 degrees, they would meet at the midpoint of the base below E. I will call the midpoint o. Now see, we can construct a right-triangle, with hypotenuse of length = ? and legs of length 4 and 5.

    we can find ? by using Pythagoras' Theorem.

    Pythagoras' Theorem: If the hypotenuse of a right-triangle is a and the legs are b and c, then we have,

    a^2 = b^2 + c^2


    once we find ?, we can find another right-triangle AOE.

    we know that the legs have length 13 and ? (which we found above), now we use Pythagoras' theorem again, to find AE




    for the second question:

    we can construct the right-triangle using the pink lines on the diagram. the legs are 13 and 4. we don't know the hypotenuse

    we wish to find the angle x. we can use the tangent ratio to do this

    remember, \tan x = \frac {\mbox { Opposite }}{ \mbox { Adjacent }} = \frac {13}{4} in this case

    so then x = \tan^{-1} \left( \frac {13}{4}\right)
    Attached Thumbnails Attached Thumbnails pyramid-ques2.gif  
    Follow Math Help Forum on Facebook and Google+

  8. #8
    Junior Member
    Joined
    Aug 2007
    Posts
    29
    Ty But I Need Help On The Very First Question I Need The Answer And Full Working Out
    Follow Math Help Forum on Facebook and Google+

  9. #9
    Junior Member
    Joined
    Aug 2007
    Posts
    29
    Ok I Gtg Bed And I Need This Done Soon Plz Go To That Site And Give Me Full Answers With Working Out So I Can Learn From That Tomorrow But I Really Need Answers Tonight Plz

    FIRST ANSWERS TO THE QUESTION I FIRST POSTED THEN HOW I DO PAGES 2-4 ON THAT LINK WITH FULL ANSWERS PLZ I REALLY NEED IT NOW OR IM IN BIG TROUBLE
    Follow Math Help Forum on Facebook and Google+

  10. #10
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by sasha9193 View Post
    Ok I Gtg Bed And I Need This Done Soon Plz Go To That Site And Give Me Full Answers With Working Out So I Can Learn From That Tomorrow But I Really Need Answers Tonight Plz

    FIRST ANSWERS TO THE QUESTION I FIRST POSTED THEN HOW I DO PAGES 2-4 ON THAT LINK WITH FULL ANSWERS PLZ I REALLY NEED IT NOW OR IM IN BIG TROUBLE
    why did you wait until the deadline was upon you to do it?

    i will see if i can go through them if i have time (i have my own homework to do), but i'm not promising anything
    Follow Math Help Forum on Facebook and Google+

  11. #11
    Junior Member
    Joined
    Aug 2007
    Posts
    29
    im really sorry but i was sick for ages
    Follow Math Help Forum on Facebook and Google+

  12. #12
    Junior Member
    Joined
    Aug 2007
    Posts
    29
    i jus need first 3 answers for questions at very beginning of post then if u can go on the site and give me full answers for the pages 2-4 ty alot if u can u a life saver
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Pyramid
    Posted in the Geometry Forum
    Replies: 1
    Last Post: July 4th 2010, 09:39 PM
  2. pyramid
    Posted in the Geometry Forum
    Replies: 4
    Last Post: June 8th 2010, 09:06 AM
  3. pyramid....
    Posted in the Geometry Forum
    Replies: 1
    Last Post: January 25th 2010, 05:05 PM
  4. a pyramid
    Posted in the Geometry Forum
    Replies: 4
    Last Post: August 26th 2008, 03:17 AM
  5. Pyramid
    Posted in the Geometry Forum
    Replies: 0
    Last Post: October 2nd 2005, 04:32 PM

Search Tags


/mathhelpforum @mathhelpforum