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In a square-root spiral, which hypotenuse will be formed after √15?

Answer and explanation

Correct answer: √16

The governing pattern is that each new hypotenuse is obtained by adding 1 to the square of the preceding hypotenuse. If the current hypotenuse is √n and a perpendicular of length 1 unit is added, then the new hypotenuse h satisfies h² = (√n)² + 1² = n + 1. Taking n = 15 gives h² = 16, so h = √16, the positive length equal to 4 units. Therefore, option C is correct. √14 is the preceding hypotenuse and √15 is the current one, so neither is the next result. √30 is also incorrect because the radicand is increased by 1, not doubled. The construction depends on the Pythagorean theorem, not on ordinary addition of radical expressions.

Related tags

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

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