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While constructing a square root spiral, Riya says that every new right triangle is congruent to the previous one because one side is taken as 1 unit each time. Which is the correct analysis of Riya’s error?

Answer and explanation

Correct answer: Only the new perpendicular is 1 unit; the other leg is the hypotenuse of the previous triangle, which changes at every step.

Only the newly added perpendicular has length 1; the other leg is the previous hypotenuse. For example, after a hypotenuse of \(\sqrt{2}\), the next one is \(\sqrt{3}\), so the triangles are not congruent. Exam tip: track the changing hypotenuse.

Related tags

Number SystemsSquare Root SpiralPythagorean TheoremGeometryConceptual Error AnalysisMathematicsClass 9 Mcq

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