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While constructing a square root spiral, Reena makes each new right triangle with one leg of 1 unit and the other leg equal to the previous hypotenuse. If the previous hypotenuse is \(\sqrt{7}\) units, what is the length of the new hypotenuse?

Answer and explanation

Correct answer: \(\sqrt{8}\)

For the new right triangle, hypotenuse² = \((\sqrt{7})^2 + 1^2 = 7+1=8\), so the hypotenuse is \(\sqrt{8}\). It is not \(2\sqrt{7}\), as lengths are not simply doubled. Exam tip: apply Pythagoras’ theorem at every step.

Related tags

Number SystemsSquare Root SpiralPythagoras TheoremSurdIrrational NumbersGrade 9 MathematicsMathematicsClass 9 Mcq

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