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(Center between two points)
The midpoint between (x₁, y₁) and (x₂, y₂) is ((x₁ + x₂) / 2, (y₁ + y₂) / 2). You average the x coordinates and average the y coordinates.
The midpoint of (2, 3) and (8, 7) is ((2+8)/2, (3+7)/2) = (5, 5).
This formula is useful for finding centers, dividing segments, and checking symmetry.
