Question

calculate sin a=0.34

Answer 1

$sina=0.34$ has already been calculated for us, but to calculate the angle, which is what I'm assuming you want to know, we must take the inverse trigonometric function of sin. 

From: $sina=0.34$, we can derive that:

$a=sin ^{-1} 0.34$

Using a scientific calculator to solve this, we can see that the degrees that a is equal to (rounded to the nearest degree) is: 

$a=20$°

Wish you luck! :)