How far apart are the points (1, 1) and (4, 5)?
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Correct answer to question 158 (Mathematics Knowledge): 5
Method
The distance formula comes from the Pythagorean theorem: the horizontal leg is 4 - 1 = 3 and the vertical leg is 5 - 1 = 4, so the distance is the root of 9 + 16, which is the root of 25, or 5.
Updated: November 2026
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