What is the legth x of the side of the triangle below?

For this case we have the following trigonometric relationship:
 cos (25) = x / 10
 From here, we must clear the value of x.
 We have then:
 x = 10 * cos (25)
 x = 9.06307787
 Rounding the result we have:
 x = 9.1
 
 x = 9.1
 option D

One statement could be 12/4=3