how to evaluate sin(a) when adj =4 and oposit side 10?

Answer 1

sketch a right triangle, two sides 4, 10.
then the hypotenuse is c^2=4^2+10^2
that works out to be 116.
so SinA=10/sqrt(116)

Answer 2

anna: you already asked this, and got an answer before you posted this. Is there something you don't understand about it? We don't have crystal balls here.