algebra1

The area of trapezoid is h( b1+b2)/5,
where h is the altitude, and b1 and b2 are the lenghts of the parallel bases. If trapezoid has an altitude of 5 inches, an area of 55 sguare inches , and one base 12 inches long, what is the lenghth, in inches, of its other base?

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  1. A = (b1+b2)h/2 = 55in^2.

    (b1+12)5/2 = 55,
    Multiply both sides by 2:
    (b1+12)5 = 110,
    5b1+60 = 110,
    5b1 = 110-60 = 50,

    b1 = 10 in.

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