Homework Help: math

Posted by danica on Saturday, November 3, 2012 at 3:34pm.

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 - Steve, Saturday, November 3, 2012 at 4:03pm
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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