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BTGmoderatorLU
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Since the formula for finding the distance between two points is the Cartesian plane is not within the scope of the GMAT, let's do it differently.

Once we create our right triangle with sides 1/2, 1/2 and x (the hypotenuse), we can apply the Pythagorean Theorem to get: (1/2)² + (1/2)² = x²