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Solve for a. Help please!

Solve for a. Help please!-example-1
User UncleDave
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\textit{using the pythagorean theorem} \\\\ c^2=a^2+b^2\implies √(c^2 - b^2)=a \qquad \begin{cases} c=\stackrel{hypotenuse}{12}\\ a=adjacent\\ b=\stackrel{opposite}{9}\\ \end{cases} \\\\\\ √(12^2 - 9^2)=a\implies √(144 - 81)=a\implies √(63)=a

User Esbanarango
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