For this case we have that by definition of trigonometric relations that the sine of an angle is equal to the opposite leg to the angle on the hypotenuse. That is to say:
[tex]Sin (43) = \frac {a} {26}[/tex]
Clearing the value of "a":
[tex]a = 26 * sin (43)\\a = 26 * 0.68199836\\a = 17.73195736[/tex]
Rounding off we have:
17.7
Answer:
Option B
