解答
$M = \left(\frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2}\right)$.
解説
The coordinates of the midpoint are the simple arithmetic averages of the endpoints' coordinates.
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What is the midpoint formula for the segment connecting $(x_1, y_1)$ and $(x_2, y_2)$?
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