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Just before constructing √15 in a square root spiral, which hypotenuse will be present?

Answer and explanation

Correct answer: √14

The square root spiral is generated step by step by adding a perpendicular segment of length 1 unit to the current hypotenuse. If the current hypotenuse is √14, then the next hypotenuse h satisfies h²=(√14)²+1²=14+1=15, so h=√15. Therefore the hypotenuse present immediately before constructing √15 is √14, making option B correct. √13 is one stage earlier in the sequence. √15 is the target that is about to be constructed, not the value already present. √16 is the following stage after √15. The essential relationship is that the squared value increases by exactly one at each construction step, so the predecessor of 15 must be 14.

Related tags

Square-Root-SpiralPredecessorSequential-ConstructionSquare Root SpiralNumber SystemsMathematicsClass 9 Mcq

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