In (bigtriangleup)XYZ, determine the cosine of angle Z.
-
A.
(frac{3}{39}) -
B.
(frac{29}{36}) -
C.
(frac{14}{5}) -
D.
(frac{7}{5})
Correct Answer: Option B
Explanation
cos z = (frac{y^2 + x^2 -z^2}{2yx})
= (frac{9 + 36 – 16}{2(3)(6)})
= (frac{29}{36})