In the figure above, has a right angle at If the length of side is and the measure of is , what is the length of side ?
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The correct answer is B.
To determine the length of side , apply the definition of the tangent of an angle in a right triangle: the tangent of is equal to the length of the side opposite angle divided by the length of the side adjacent to angle . Thus in this case, , which gives . Use a calculator, set to degree mode, to compute that .