Answers

2015-01-29T22:36:27+08:00
Given two points (x_1,y_1) and (x_2,y_2), the distance (length) is:  \sqrt{ (x_2 - x_1)^2 + (y_2-y_1)^2}
while the midpoint formula is:
( \frac{x_1 +x_2}{2},  \frac{y_1+y_2}{2})
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