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Math Help - AREA OF A TRIANGLE <3 help plz

  1. #1
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    AREA OF A TRIANGLE <3 help plz

    find the area of traingle ABC if a = 10cm ,b = 3cm and c= 9cm

    help please <3

    and i have my final exam tomorrow... so if u want to help me tonight for a while private message me we can work on msn together! yayyy ^_^ lolll
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Noelle View Post
    find the area of traingle ABC if a = 10cm ,b = 3cm and c= 9cm

    help please <3

    and i have my final exam tomorrow... so if u want to help me tonight for a while private message me we can work on msn together! yayyy ^_^ lolll
    Hero's (Heron's?) formula says that the area of a triangle is
    A = \sqrt{s(s - a)(s - b)(s - c)}
    where
    s = \frac{a + b + c}{2}
    is called the semi-perimeter.

    -Dan
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  3. #3
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    Quote Originally Posted by topsquark View Post
    Hero's (Heron's?)
    Heron's

    --

    You can also combine Law of cosine and Law of sines to get the area, but I prefer to use Heron's Formula.
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  4. #4
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    rawr

    so is it supposed to be 10+3+9 = 22/2 = 11?
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