Pythagorean Theorem

Solve with Pythagorean Theorem
a = side needed to find 
b = 9
c = 11

a² + 9² = 11²   {substituted into the Pythagorean Theorem}
a² + 81 = 121   {squared the 9 and the 11}
a² = 40   {subtracted 81 from both sides}
a = √40   {took the square root of both sides}
a ≈ 6.32   {evaluated the square root of 40}

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