Answer:
[tex]\large\boxed{2.\ \dfrac{4}{5}}[/tex]
Step-by-step explanation:
Look at th picture.
[tex]\sin\theta=\dfrac{y}{r}[/tex]
We have the point P(21, 28).
Calculate the value of r:
[tex]r=\sqrt{21^2+28^2}=\sqrt{441+784}=\sqrt{1225}=35[/tex]
Calculate sine:
[tex]\sin\theta=\dfrac{28}{35}=\dfrac{28:7}{35:7}=\dfrac{4}{5}[/tex]
