If you take the generic equation for a circle, and make three equations out of it by
substituting the coordinates of the three points, you can solve them simultaneously
and derive a single solution for the center and radius of a circle. In other words, you
can always find one, and only one, circle that those three points lie on.
You have to be able to sing and dance pretty well in the key of algebra to do that, but
once you've done it, it feels great. Then your next exercise is to write a simple computer
program that takes the three points as an input, and outputs the center and radius of
the circle. We wrote that once, when we wanted a tool to explore the outline of the
Mandelbrot set. Totally useless, and loads of fun.
just one
Yes a plane can always be drawn three any three points, whether they are linear or not.
You have to have three or more points to have non-colinear points because any two points determine a line. Noncolinear are NOT on the same line.
No. Any two points can be made to form a line.
Yes. In fact any three points that are not collinear define a plane and therefore MUST lie on a plane.
A plane. A circle can also pass through three non-co-linear points.
Yes. In fact, given any three non-collinear points, there is one (and only one) circle that passes through all three points.
just one
Yes a plane can always be drawn three any three points, whether they are linear or not.
You have to have three or more points to have non-colinear points because any two points determine a line. Noncolinear are NOT on the same line.
Any Euclidean plane has infinitely many points.
No. Any two points can be made to form a line.
Only one plane can pass through 3 non-collinear points.
Through any three noncollinear points, there is exactly one plane.
Of course. The vertices of a triangle, and any three vertices of any other polygon, are non-collinear. In the case of a triangle and a quadrilateral, if you had three collinear vertices, then you couldn't have the polygon.
Yes. In fact any three points that are not collinear define a plane and therefore MUST lie on a plane.
No, A plane can be drawn through any 3 points. If the 3 points are collinear then they make a line and a plane can contain a line. If the points are noncollinear then they can be used to form the corners of a triangle; all points of a triangle are in the same plane.