Answer:
D
Step-by-step explanation:
The solution to the problem is

How did we arrive at this:
We are going to use trigonometric ratios to solve this problem. The diagram of the sail forms a perfect and unique right angle triangle.
From the diagram, we can easily decipher the:
- hypotenuse axis
- opposite axis
- adjacent axis
From the given diagram, we know:
Adjacent axis and the opposite angle;
tan Ф =

The unknown axis faces the opposite side;
Opposite = adjacent x tan Ф
Opposite = 2 x tan Ф
Note;
tan Ф = 1/ cot Ф
opposite = 2 x 1/ cot Ф