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Math Help - A rhombus

  1. #1
    Newbie
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    Oct 2008
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    A rhombus

    i need to know the area of a rhombus ABCD if mLABD =60 and AB = 16 m.

    find the area of rhombus ABCD if AC = 10 cm and AB = 13 cm

    plz just show me how to get started, don't tell me the answer
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  2. #2
    MHF Contributor
    Joined
    Apr 2008
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    Let the diagonals AC and BD intersect at point P.

    In the first question, use trigonometry to calculate the length of BP and AP. Note that L(AP) = L(CP) and L(BP) = L(DP).

    In the second question, AP is half the length of AC. Use the Pythagorean Theorem to calculate the length of BP from here.
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