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In a square root spiral, after (\sqrt{8}), which hypotenuse is obtained by adding a (1) unit perpendicular?

Answer and explanation

Correct answer: (\sqrt{9})

The square-root spiral uses the Pythagorean theorem to create successive lengths. If the existing hypotenuse is \(\sqrt{8}\) and a perpendicular side of length 1 is added, the new hypotenuse \(L\) satisfies \(L^2=(\sqrt{8})^2+1^2\). Therefore \(L^2=8+1=9\), so \(L=\sqrt{9}\).

Thus the next hypotenuse is \(\sqrt{9}\), which is also 3. The construction does not subtract 1, keep the same length, or produce \(\sqrt{10}\), because the added perpendicular side contributes the square of its length, namely 1. Hence option C follows directly from the Pythagorean theorem.

Related tags

Number-SystemsSquare-Root-SpiralNext-Root

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