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To construct √11 in a square-root spiral, what should be the length of the previous hypotenuse?

Answer and explanation

Correct answer: √10

The governing concept is the Pythagorean construction used in a square-root spiral. A segment of length 1 unit is drawn perpendicular to the previous hypotenuse. If that previous hypotenuse is √n, then the new hypotenuse H satisfies H² = (√n)² + 1² = n + 1. To construct √11, we set n + 1 = 11, giving n = 10. Therefore, the previous hypotenuse must be √10, so option B is correct. If √9 were used, the next hypotenuse would be √10. If √11 were used, the next one would be √12, and √12 would lead to √13. These alternatives therefore represent the wrong stage of the construction.

Related tags

Number-SystemsSquare-Root-SpiralPrevious-HypotenusePythagorean-TheoremSquare Root SpiralNumber SystemsMathematicsClass 9 Mcq

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