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Math Help - Check my answer on finding the area of an isoscels triangle?

  1. #1
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    Check my answer on finding the area of an isoscels triangle?

    Has a base of 6 cm, and has a semi-perimeter of 11cm. What is the area?

    Sq. Rt. 11(11-6)(11-6)(11-6)
    Sq. Rt. 11(5)(5)(5)
    sq. rt. 11 * sq. rt. 125 = 37.1 cm^2
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  2. #2
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    Re: Check my answer on finding the area of an isoscels triangle?

    the triangle is not equilateral ...

    2x + 6 = 22

    x = 8

    the sides are 8, 8, and 6
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  3. #3
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    Re: Check my answer on finding the area of an isoscels triangle?

    So the answer would be 22.2cm^2 ?
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  4. #4
    Senior Member MacstersUndead's Avatar
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    Re: Check my answer on finding the area of an isoscels triangle?

    Yes.

    \text{area} = \sqrt{s\left(s-a\right)\left(s-b\right)\left(s-c\right)}
    = \sqrt{11(3)(3)(5)}
    = 3 * \sqrt{55}

    which is equal to your answer.
    Thanks from SoConfused123
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