[tex]\: b \implies \: \sqrt{{c}^{2} - {a}^{2} } \\ b = \: \sqrt{{15}^{2} - {12}^{2} } \\ b = \sqrt{225 - 144} \\ b = \sqrt{81} \\ \boxed{\blue{b \implies \: 9}}[/tex]
#CarryOnLearning
