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Starting from (\sqrt{1}) in a square root spiral, which is the third hypotenuse?

Answer and explanation

Correct answer: (\sqrt{3})

In a square root spiral, each new right triangle uses the previous hypotenuse and a new perpendicular side of length 1. By the Pythagorean theorem, the squared hypotenuse increases by 1 at every step. Starting with a hypotenuse of \sqrt{1}, the next one is \sqrt{2}, and the following one is \sqrt{3}.

Counting the hypotenuses in order gives first: \sqrt{1}; second: \sqrt{2}; third: \sqrt{3}. Therefore the third hypotenuse is \sqrt{3}, which is option B. It is important to count the initial \sqrt{1} as the first member of the sequence. If the counting began after the initial triangle, a different label might be obtained, but that is not the convention stated here.

Related tags

Number-SystemsSquare-Root-SpiralSequence

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