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Which previous hypotenuse is used to make √21 in a square root spiral?

Answer and explanation

Correct answer: √20

The governing construction principle is the Pythagorean theorem applied repeatedly. In a standard square root spiral, a perpendicular segment of length 1 unit is drawn to the existing hypotenuse. If the existing hypotenuse is √n and the next one is h, then h²=(√n)²+1²=n+1. To obtain √21, we need n+1=21, which gives n=20. Therefore the immediately preceding hypotenuse is √20, so option B is correct. Starting with √19 would produce √20, not √21. Starting with √21 would produce √22, and √22 is already beyond the required construction. The sequence advances through √19, √20, √21, and √22 in that order.

Related tags

Number-SystemsSquare-Root-SpiralPythagorean-TheoremSquare Root SpiralNumber SystemsMathematicsClass 9 Mcq

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