Step-by-step explanation:
Using trigonometric rules
[tex] \csc(R) = \frac{1}{ \sin( R ) } [/tex]
sin R = QP / QR
[tex] \frac{1}{ \sin(R) } = \frac{QR}{QP} [/tex]
So we have
[tex] \csc(R) = \frac{26}{24} \\ \\ \csc(R) = \frac{13}{12} [/tex]
Hope this helps you
