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    KBBY824's Avatar
    KBBY824 Posts: 1, Reputation: 1
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    #1

    Nov 30, 2010, 01:39 PM
    Help with finding perimeter of an isosceles triangle?
    An isosceles triangle has legs that are 15 cm and a perimeter of 48 cm. What is the perimeter of a similar isosceles triangle with a base of 12 cm?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Nov 30, 2010, 11:41 PM

    The ratio of a side to the perimeter is 15:48 = 5:16

    You have the same ratio for the bigger triangle since they are similar.
    12:P

    where this is equal to 5:16

    Hence, you have:



    Find P
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