Question

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Answer 1

Respuesta:

12 unidades

${15}^{2} = {9}^{2} \\ 225 = 81 \times {x}^{2} \\ 81 + {x}^{2} = 225 \\ {x}^{2} = 81 - 225 \\ {x}^{2} = 144 \\ {12}^{2} = {12}^{2}$