Discussion
What is the distance between the points (3, 4) and (-3, -4) ?
Answer: A
Correct answer: 10
\[d = \sqrt{(-3-3)^2 + (-4-4)^2} = \sqrt{36 + 64} = \sqrt{100} = 10\]
Both points lie 5 units from the origin on the same line through it, so the distance is twice that, which is a useful check.
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