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To construct √2 on the number line, two perpendicular sides of a right triangle are each 1. What is the length of the hypotenuse?

Answer and explanation

Correct answer: √2

The governing result is the Pythagorean theorem: in a right triangle, the square of the hypotenuse equals the sum of the squares of the perpendicular sides. With both legs equal to 1, let the hypotenuse be h. Then h² = 1² + 1² = 1 + 1 = 2, so h = √2 because a length is positive. Therefore option B is correct. Choosing 1 ignores the second perpendicular side, choosing 2 adds lengths instead of their squares, and √3 does not follow from the Pythagorean calculation. This construction is used to transfer the irrational length √2 to the number line.

Related tags

Real-NumbersSquare-RootPythagorean-TheoremRepresenting Real Numbers On The Number LinePolynomialsMathematicsClass 10 Mcq

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