trig or geom
posted by starlight18 .
i have to use pythagorean theorem to find the legmeasure 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 topmost angle.. what is x? i don't know how to use cosine with the problem

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