Results 1 to 3 of 3

Math Help - Weird question???

  1. #1
    Junior Member
    Joined
    May 2010
    From
    Palmy
    Posts
    64

    Unhappy Weird question???

    This question is in my engineering course and i am having lots of trouble with it. Mainly because i thought you could only find measurements for the length and breadth of rectangle if you are given the perimeter and area, however this question only gives you the perimeter. HERE'S THE QUESTION ANYWAY.

    1) A rectangle has a perimeter of 26m.
    a)Express its length(l) in terms of the breadth(b)?
    b) Write an expression for the area of the rectangle in terms of (b) only?
    c) Find the breadth of this rectangle if its area is 38metres^2
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor harish21's Avatar
    Joined
    Feb 2010
    From
    Dirty South
    Posts
    1,036
    Thanks
    10
    Quote Originally Posted by GAVREED2 View Post
    This question is in my engineering course and i am having lots of trouble with it. Mainly because i thought you could only find measurements for the length and breadth of rectangle if you are given the perimeter and area, however this question only gives you the perimeter. HERE'S THE QUESTION ANYWAY.

    1) A rectangle has a perimeter of 26m.
    a)Express its length(l) in terms of the breadth(b)?
    b) Write an expression for the area of the rectangle in terms of (b) only?
    c) Find the breadth of this rectangle if its area is 38metres^2
    If l is the length and b is the breadth of the rectangle, then its perimeter is P=2(l+b)

    so you have: 2(l+b)=26

    (a) 2(l+b)=26 \implies (l+b)=13 \implies l = 13-b

    (b) \mbox{Area} = l \times b = (13-b) b

    (c) (13-b)b = 38 solve for b
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    May 2010
    From
    Palmy
    Posts
    64

    Thanks!

    Cheers mate! I get the question now lol...actually fairly simple.

    thanks for your insight
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. weird trig question?
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: February 23rd 2011, 08:16 PM
  2. weird question
    Posted in the Differential Equations Forum
    Replies: 0
    Last Post: May 24th 2010, 10:30 PM
  3. weird question
    Posted in the Statistics Forum
    Replies: 3
    Last Post: March 13th 2010, 01:03 PM
  4. weird question
    Posted in the Advanced Algebra Forum
    Replies: 1
    Last Post: September 29th 2009, 10:47 AM
  5. weird topology question...
    Posted in the Advanced Algebra Forum
    Replies: 3
    Last Post: April 20th 2008, 08:01 PM

Search Tags


/mathhelpforum @mathhelpforum