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If a 1-unit perpendicular is added to the hypotenuse √n, what will the new hypotenuse generally be?

Answer and explanation

Correct answer: √(n + 1)

The general rule follows directly from the Pythagorean theorem. Let the old hypotenuse be √n and let the new hypotenuse be h after a perpendicular side of length 1 is added. The two perpendicular sides of the new right triangle have lengths √n and 1, so h² = (√n)² + 1² = n + 1. Since h is a length, h = √(n + 1), which makes option B correct. Option A subtracts 1 and describes the preceding step rather than the new one. Option C incorrectly doubles n, and option D squares n without using the added unit side. This formula explains why the spiral produces successive square-root lengths.

Related tags

Square-Root-SpiralGeneral-RulePythagorean-TheoremSquare Root SpiralNumber SystemsMathematicsClass 9 Mcq

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