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While constructing a square root spiral, each new right triangle is drawn on the hypotenuse of the previous triangle. If at one stage the hypotenuse is \(\sqrt{10}\) and the new perpendicular side is 1 unit, what will be the hypotenuse of the new triangle?

Answer and explanation

Correct answer: \(\sqrt{11}\)

By Pythagoras’ theorem, new hypotenuse² = \((\sqrt{10})^2+1^2=10+1=11\). Hence the new hypotenuse is \(\sqrt{11}\). \(\sqrt{20}\) results from squaring the previous hypotenuse incorrectly. Exam tip: square the radical first.

Related tags

Number SystemsSquare Root SpiralPythagoras TheoremIrrational NumbersRight TrianglesMathematicsClass 9 Mcq

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