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Why is the (1) unit perpendicular drawn at (90^\circ) in a square root spiral?

Answer and explanation

Correct answer: To construct a right-angled triangle

At each step of a square root spiral, a new side of length 1 unit is drawn at 90° to the previous side, forming a right-angled triangle. Pythagoras’ theorem then gives successive hypotenuse lengths such as \(\sqrt{2}, \sqrt{3}, \sqrt{4}\), and so on. Option B is incorrect because the new hypotenuse is generally longer than the previous side. Exam tip: A 90° angle in such a construction signals the use of a right triangle and Pythagoras’ theorem.

Related tags

Square Root SpiralRight TrianglePythagoras TheoremGeometric ConstructionNumber SystemsMathematicsClass 9 Mcq

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