Square the two smaller ones and see if that total equals the square of the larger one.
A set of points on a straight line are called 'collinear points'.
Infinitely many. The trajectory of a typical space mission may be adjusted several hundred times and all these changes need to be accommodated in the set of points.
Collinear set of points
The complement of the triangle in the plane.
If they are a Pythagorean triple then they will form a right angle triangle
Any plane figure with more than three sides. Any spherical triangle.
A spherical surface, with its center at the given point, and its radius equal to the given distance.
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An edge is the set of points where two (or more) planes meet. Since a triangle must be in just one plane, it cannot have any edges. It has one face, which is part of the plane containing the triangle.
In ordinary English, sphere can mean a solid or a hollow spherical shape. In mathematics, a sphere is the set of all points equidistant from a point (and thus not a solid). The terms "solid sphere" or "spherical solid" can be used as needed to avoid confusion.
For stableford, you use your handicap to determine which holes you get strokes on. Say for example you play off 18, you get a shot a hole. So the par on each hole in now effectively bogey (which will be your set score). 5 points - 3 under set score 4 points - 2 under set score 3 points - 1 under set score 2 points - set score 1 point - 1 over set score 0 points - 2 or more over set score.
what is The set of all points collinear to two points?
No, but is an infinite set of points.