Start by replacing the conditions of the triangle in the figure
find the missing side of the triangle using the Pythagorean theorem
[tex]\begin{gathered} c^2=a^2+b^2 \\ c^2=4^2+3^2 \\ c^2=16+9 \\ c^2=25 \\ c=\sqrt{25} \\ c=5 \end{gathered}[/tex]
by definition csc of an angle is:
[tex]csc(\theta)=\frac{hyp}{opp}[/tex]
then, if the angle is A,
[tex]cscA=\frac{5}{3}[/tex]
