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A student adds nine new right triangles, each with one unit as the new perpendicular side, after starting a square root spiral of unit length to represent \(\sqrt{10}\). Is the method correct?

Answer and explanation

Correct answer: Yes, because the tenth hypotenuse has length \(\sqrt{10}\).

A square root spiral starts with \(\sqrt{1}\). Each added right triangle increases the square of the hypotenuse by 1, so after 9 new triangles the hypotenuse is \(\sqrt{10}\). Exam tip: count from the initial \(\sqrt{1}\), not from zero.

Related tags

Number SystemsSquare Root SpiralPythagoras TheoremIrrational NumbersGeometry ConstructionMathematicsClass 9 Mcq

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