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Which option gives a correct equation for one step of the spiral?

Answer and explanation

Correct answer: (√26)² + 1² = 27

The governing concept is the Pythagorean theorem in one step of a square-root spiral. If the existing hypotenuse is √26 and the newly constructed perpendicular segment has length 1, the square of the next hypotenuse equals the sum of the squares of these perpendicular parts. Hence (√26)² + 1² = 26 + 1 = 27, so the new hypotenuse is √27. Option A is therefore correct. In option B, the added segment is incorrectly taken as 2, giving 26 + 4 = 30. Option C starts with √27 and produces 28 after adding 1, while option D starts with √25 and produces 26. Thus only A represents the correct spiral step.

Related tags

Number SystemsSquare Root SpiralPythagorean TheoremRadicalsMathematicsClass 9 Mcq

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