Results 1 to 2 of 2

Thread: ratio and proportion

  1. #1
    Newbie
    Joined
    Mar 2010
    Posts
    2

    ratio and proportion

    The measurements of 2 rectangles are:

    (a) length 24cm and width 18cm.

    (b) length 48cm and width 14cm.

    Find:

    (1) The ratio of their areas.

    (2) The ratio of their perimeters.

    please show all working out
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Mar 2010
    Posts
    1,021
    Thanks
    263
    There's no trick - you have to calculate the area and perimeter of both rectangles and take the ratio:

    (1)  \frac{\text{Area of a}}{\text{Area of b}} = \frac{\text{length of a * width of a}}{\text{length of b * width of b}}

    (2)  \frac{\text{Perimeter of a}}{\text{Perimeter of b}} = \frac{2*(\text{length of a + width of a})}{2*(\text{length of b + width of b})} = \frac{\text{length of a + width of a}}{\text{length of b + width of b}}

    I'll let you substitute the lengths and do the calculations.

    Post again of you're still having trouble.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Ratio Proportion
    Posted in the Algebra Forum
    Replies: 4
    Last Post: Dec 4th 2011, 12:21 AM
  2. ratio and proportion
    Posted in the Statistics Forum
    Replies: 1
    Last Post: Mar 8th 2010, 10:34 AM
  3. Ratio and Proportion
    Posted in the Algebra Forum
    Replies: 5
    Last Post: Dec 6th 2009, 09:16 PM
  4. Ratio and proportion 2
    Posted in the Algebra Forum
    Replies: 1
    Last Post: Oct 17th 2009, 06:57 AM
  5. Ratio and proportion?
    Posted in the Algebra Forum
    Replies: 1
    Last Post: Jul 1st 2009, 01:19 AM

Search Tags


/mathhelpforum @mathhelpforum