Answer and Explanation
Your Answer is
Correct Answer is F
Explanation
BC can be obtained by using the law of cosines through known quantities, BC2=162+72-2×7×16 × cos 36
54. In △ABC shown below, lengths given are in inches, and the measure of ∠A is 36°. Which of the following values is closest to the length, in inches, of BC ?
(Note: For any triangle with side lengths a, b, and c, 
, where θ is the measure of the angle opposite the side of length a. The value of cos36° is approximately 0.81.)
