[tex] {c}^{2} - {b}^{2} = {a}^{2} [/tex]
[tex] {15}^{2} - {13}^{2} = {56}^{2} [/tex]
[tex] \sqrt{56} = 7.5\: yd[/tex]
//
[tex]sin = \frac{opp}{hyp} [/tex]
[tex] {sin}^{ - 1} = \frac{13}{15} [/tex]
[tex] = 60 \: degrees[/tex]
//
[tex]180 - 90 - 60 = 30 \: degrees[/tex]
