Phytagoras
[tex] {a}^{2} = {c}^{2} - {b}^{2} \\ {a}^{2} = {21}^{2} - {15}^{2} \\ {a}^{2} = 441 - 225 \\ {a}^{2} = 216 \\ a = \sqrt{216} \\ a = \sqrt{36 \times 6} \\ a = 6 \sqrt{6} \: cm \: (B)[/tex]
A = √21² - 15²
= √(21(21) - (15(15)
= √441 - 225
= √216
= √36.6
= √6².6
= 6√6
[tex]{\color{yellow}{\boxed{\tt{ \star \: CaptainInnovaGR \: \star}}\:}}[/tex]
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Phytagoras
[tex] {a}^{2} = {c}^{2} - {b}^{2} \\ {a}^{2} = {21}^{2} - {15}^{2} \\ {a}^{2} = 441 - 225 \\ {a}^{2} = 216 \\ a = \sqrt{216} \\ a = \sqrt{36 \times 6} \\ a = 6 \sqrt{6} \: cm \: (B)[/tex]
A = √21² - 15²
= √(21(21) - (15(15)
= √441 - 225
= √216
= √36.6
= √6².6
= 6√6
[tex]{\color{yellow}{\boxed{\tt{ \star \: CaptainInnovaGR \: \star}}\:}}[/tex]