Question

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Answer 1

Explicación paso a paso:

$b = \sqrt{ {c}^{2} - {a}^{2} } \\ \\ b = \sqrt{ {2}^{2} - {1}^{2} } \\ \\ b = \sqrt{4 - 1} \\ \\ b = \sqrt{3} \\ \\ b = 1.732$