Did the ball touch the line? Tennis hawk eye (in-out) vs Euclidean geometry (tangent to a circle)
In Euclidean geometry, point and line are primitive notions (not defined in terms of previously defined concepts).
In Euclidean geometry, a straight line has no width.
In Euclidean geometry, a point has no length, width, or thickness.
A tangent line to a circle touches the circle at exactly one point.
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