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math

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Find the area and perimeter of an isosceles triangle the base is 16.0 ft and one of the legs is 20.0 ft i don't know the height how would i do this?

  • math - ,

    half the base is 8
    h^2 = 20^2 - 8^2 = 400-64 = 336
    h = √336 = 4√21

    a = 1/2 bh = 1/2 (16)(4√21) = 32√21
    p = 20+20+16 = 56

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