[tex]a \implies \: \sqrt{{c}^{2} - {b}^{2} } \\ a = \: \sqrt{{20}^{2} - {16}^{2} } \\ a = \sqrt{400 - 256} \\ a = \sqrt{144} \\ \boxed{\blue{a \implies \: 12}}[/tex]
#CarryOnLearning
