trig or geom

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i have to use pythagorean theorem to find the leg-measure of x. in the formula, x would be a^2. the hypotenuse is 11 and "b" is unknown. there is also a cosine with a measure of .4 at the top-most angle.. what is x? i don't know how to use cosine with the problem

  • trig or geom -

    Using the topmost angle, the cosine is

    adjacent/hypotenuse

    so .4 = b/11, making b=4.4

    Now, with c=11,b=4.4, that means that
    a^2 = 11^2 - 4.4^2 = 101.64, so
    a = 10.1

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