Results 1 to 12 of 12

Math Help - Pyramid Problem

  1. #1
    Junior Member
    Joined
    Jul 2009
    Posts
    35

    Exclamation Pyramid Problem

    The regular pyramid roof of the Washington Monument is 55 ft. high and has a base which is a square 35 ft. 2 in. on a side. The marble slabs of which it is built weigh 165 lb. per cu. ft. If the room covered by the roof is a pyramid whose square base is 34 ft. on a side and 54 ft. high, what is the weight of the roof? (Neglect the six small windows.)
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Newbie
    Joined
    Feb 2010
    From
    Fairfield, Ca
    Posts
    21
    Start by calculating the volume. The bigger pyramid minus the smaller one (room/empty space)
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Jul 2009
    Posts
    35
    Quote Originally Posted by Solarmew View Post
    Start by calculating the volume. The bigger pyramid minus the smaller one (room/empty space)

    I'm confuse. Can you explain it more? What will I do in the weight of the marble?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Feb 2010
    From
    Fairfield, Ca
    Posts
    21
    you have to find the volume of the roof, so you take the outside limits, which are defined by the hight of 55' and a square base with a side of 35' 2" and the inside limits (because the room itself is empty and does not add to the weight, so you subtract its volume from the total)
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Junior Member
    Joined
    Jul 2009
    Posts
    35
    Quote Originally Posted by Solarmew View Post
    you have to find the volume of the roof, so you take the outside limits, which are defined by the hight of 55' and a square base with a side of 35' 2" and the inside limits (because the room itself is empty and does not add to the weight, so you subtract its volume from the total)

    how will I compute for the area of the base of the roof??
    I'm confused with that base which is a square 35 ft. 2 in. on a side. What's the meaning of that statement??
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Newbie
    Joined
    Feb 2010
    From
    Fairfield, Ca
    Posts
    21
    it means that the base is a square (all sides are equal length) with one side being 35'2"... how do you find an area of a square?
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Junior Member
    Joined
    Jul 2009
    Posts
    35
    Quote Originally Posted by Solarmew View Post
    it means that the base is a square (all sides are equal length) with one side being 35'2"... how do you find an area of a square?
    I know that the base is a square which is 35 ft on each side, but what the use of 2in?

    Can you compute it for me?, so I can see your solution..
    Follow Math Help Forum on Facebook and Google+

  8. #8
    Newbie
    Joined
    Feb 2010
    From
    Fairfield, Ca
    Posts
    21
    what do you mean what's the use? XD it's the length 35feet and 2 inches XD ... you should convert it into inches to ease calculations :] (there are 12 inches in a foot)
    Follow Math Help Forum on Facebook and Google+

  9. #9
    Junior Member
    Joined
    Jul 2009
    Posts
    35
    Quote Originally Posted by Solarmew View Post
    what do you mean what's the use? XD it's the length 35feet and 2 inches XD ... you should convert it into inches to ease calculations :] (there are 12 inches in a foot)
    I will add the 2 measurement 35 ft and 26 ftto get the side is that what are you trying to say,.,Please explain it clearly I don't understand your explanation or you can compute it for me.
    Follow Math Help Forum on Facebook and Google+

  10. #10
    Newbie
    Joined
    Feb 2010
    From
    Fairfield, Ca
    Posts
    21
    i dunno how much clearer to explain it X.X
    you can type "what is 35 feet 2 inches in inches" in google and it'll tell you...
    Attached Thumbnails Attached Thumbnails Pyramid Problem-pyramid.jpg  
    Follow Math Help Forum on Facebook and Google+

  11. #11
    Junior Member
    Joined
    Jul 2009
    Posts
    35
    Quote Originally Posted by Solarmew View Post
    i dunno how much clearer to explain it X.X
    you can type "what is 35 feet 2 inches in inches" in google and it'll tell you...

    Thanks,.I solve now the problem ^^

    Can you teach me how to compute it manually

    35 feet 2 inches = 35.1666667 feet

    how it become 35.1666667?
    Follow Math Help Forum on Facebook and Google+

  12. #12
    Newbie
    Joined
    Feb 2010
    From
    Fairfield, Ca
    Posts
    21
    there are 12 inches in one foot... it's easier to convert the length to inches, this way all you have to do is:

    35*12(because there are 12 inches in a foot)+2(the remaining two inches)
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Pyramid Problem
    Posted in the Geometry Forum
    Replies: 3
    Last Post: June 10th 2010, 11:56 PM
  2. problem in pyramid question
    Posted in the Geometry Forum
    Replies: 1
    Last Post: March 30th 2010, 03:36 AM
  3. Pyramid problem
    Posted in the Geometry Forum
    Replies: 1
    Last Post: January 26th 2010, 08:58 AM
  4. Pyramid Volume Problem
    Posted in the Algebra Forum
    Replies: 2
    Last Post: October 23rd 2009, 11:35 AM
  5. Pyramid Math Problem.
    Posted in the Math Topics Forum
    Replies: 2
    Last Post: October 29th 2008, 11:06 PM

Search Tags


/mathhelpforum @mathhelpforum