3. Use a tripod as an example. It has 3 legs that can move around, yet as long as they are the same size, it stands up straight.
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Three
Three.
It takes three points to make a plane. The points need to be non-co-linear. These three points define a distinct plane, but the plane can be made up of an infinite set of points.
Coplanar means "on the same plane". A plane can be a figure or shape like a rectangle. Coplanar points means points that belong on the same plane.
3 non-collinear points define one plane.