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The second hypotenuse of a square-root spiral is √2. What will be the fourth hypotenuse?

Answer and explanation

Correct answer: √4

The governing concept is the repeated use of the Pythagorean theorem in a square-root spiral. At each stage, a perpendicular segment of length 1 unit is added to the previous hypotenuse. If one hypotenuse is √n, the next hypotenuse has square (√n)² + 1² = n + 1, and therefore has length √(n + 1). The sequence is consequently √1, √2, √3, √4, √5, and so on. Since the second hypotenuse is given as √2, the third is √3 and the fourth is √4. Therefore, option B is correct. Option A is one stage earlier, while √5 and √6 occur at later stages. The answer follows from the construction sequence, not from simply adding 1 to the radical itself.

Related tags

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

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