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A student says that to represent \(\sqrt{17}\) on a square root spiral, a perpendicular side of length 4 units should be drawn because \(17-1=16\). Why is this statement incorrect?

Answer and explanation

Correct answer: The new perpendicular side must be 1 unit; with the previous hypotenuse \(\sqrt{16}\), it forms \(\sqrt{17}\)

In a square root spiral, each new right triangle uses the previous hypotenuse and a new side of 1 unit. Since \(\sqrt{16}^2+1^2=16+1=17\), the new hypotenuse is \(\sqrt{17}\). A side of 4 gives \(16+16=32\), not 17. Exam tip: check the sum of squares using Pythagoras' theorem.

Related tags

Number SystemsSquare Root SpiralPythagoras TheoremIrrational NumbersGeometryGrade 9MathematicsClass 9 Mcq

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