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At which step is a hypotenuse of length 3 units obtained for the first time?

Answer and explanation

Correct answer: The √9 step

The spiral labels its successive hypotenuses by square roots. To find the step whose hypotenuse has actual length 3, express 3 as a square root: 3 = √9, because 3² = 9. Therefore the required hypotenuse appears at the √9 step. Option D is correct. The values √6, √7 and √8 are all less than 3, since their radicands are less than 9; hence none of them can represent a length of exactly 3 units. This question tests the distinction between the number under the radical and the value of the radical itself. One should square the desired length, not select the radicand that is numerically closest by appearance. In the spiral, the √9 stage is also the stage at which the hypotenuse is exactly 3 units long.

Related tags

Number SystemsSquare Root SpiralSquare RootsMathematicsClass 9 Mcq

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