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When √3 is formed from √2 in a square root spiral, which wrong idea should be avoided?

Answer and explanation

Correct answer: Thinking that √2 + 1 = √3

The important concept is that the new hypotenuse is determined by the sum of squares, not by ordinary addition of the two side lengths. Starting with √2 and adding a perpendicular side of length 1, the Pythagorean theorem gives h² = (√2)² + 1² = 2 + 1 = 3, so h = √3. It is not correct to write √2 + 1 = √3; numerically, √2 + 1 is about 2.414, whereas √3 is about 1.732. Thus option A identifies the misconception to avoid. Options B, C, and D describe the actual construction and reasoning used to obtain √3, so they are not wrong ideas.

Related tags

Number-SystemsSquare-Root-SpiralCommon-MisconceptionPythagorasSquare Root SpiralNumber SystemsMathematicsClass 9 Mcq

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