You know the length of the side y, the length of side x, and that the hypotenuse is the diameter of the circle. If h = 8, then since x = rcos(theta), where r is the radius of the circle, then x = 8cos(theta) and therefore your adjacent angle is arccos(x/8). Likewise, your opposite angle is arcsin(y/8). I have just given you all your angles. Do the rest of the algebra yourself. If you want
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