For this case, we have that by definition:
Let "x" be an angle of any vertex of a right triangle.
[tex]Sin (x) = \frac {Cathet \ opposite} {hypotenuse}[/tex]
So, if we want to find the sine of angle A:
[tex]Sin (A) = \frac {3} {5}[/tex]
Thus, the sine of angle "A" is[tex]\frac {3} {5}[/tex]
Answer:
[tex]\frac {3} {5}[/tex]
Option A
