Question

What is the value of x to the nearest tenth?

Answer 1

$\tan(\Theta) = \dfrac{\text{opp}}{\text{adj}}$

$\tan(43) = \dfrac{x}{12}$

$x = \tan(43) \times 12$

$x = 11.2$

Answer 2

You have 2 legs and the angle, the angle is opposite to the leg, 
so we can write TAN of the angle

tan(43°)= (opposite leg)/(adjacent leg)
tan(43°)= x/12
x=12*tan(43°)≈ 11.2