Please help me I will give branliest! Find the indicated trig ratio and write your answer as a simplified fraction. Image attached

[tex]cosec( \theta) = \frac{1}{sin( \theta)} [/tex]
[tex]sin( \theta) = \frac{opposite}{hypotenuse} [/tex]
[tex]cosec( \theta) = \frac{hypotenuse}{opposite} [/tex]
[tex]cosec( \theta) = \frac{21}{4 \sqrt{5} } [/tex]