Answer:
12.8
Explanation:
tan(theta) = opposite/adjacent
in this question, theta should be 59 deg, opposite is EF which is x, and adjacent is DE which is 7.7
So plug in these data
tan(59deg) = x/7.7 ==> x = 7.7 * tan(59deg) ~~12.8
3.7m questions
4.8m answers