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Math Help - ratio and proportion

  1. #1
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    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
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  2. #2
    Super Member
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    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.
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