Question 1093567
Question 1093517
If three points A, B, C in a plane have coordinates (-2,1), (1,6) and (8,1), respectively
the distance between A and B is..?
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It's a right triangle calculation - find the hypotenuse.
{{{AB = sqrt(diffy^2 + diffx^2) = sqrt(5^2 + 3^2) = sqrt(34)}}}
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Do the other 2 the same way.
Know this.  It will come up often.