Infinite.
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many points, even curved line as long as the line is not broken it could go on for infinity!
A line through a circle that does not go through the center of the circle is a secant line. A line through a circle that does go through the center is still a secant line, by the way. Compare this to a line segment that has its two endpoints on the circumference of the circle. That line segment is a cord of the circle. If that cord of the circle passes through the center of the circle, then the cord is a diameter of that circle.
Two planes intersecting could look like an X and then a third one could go right down the middle.
planes are used for cargo shipping, passenger shipping, or just sight seeing.
A circle with a straight line through it, usually at an angle, and often with a small dot where the centre of the circle would be (also on the line, to clarify that the line does go through the centre).