Two points. These may coincide if the line is a tangent to the sphere.
Tangent
A Vertex is the point of intersection, and a Perpendicular Vertex is a vertex with all 90 degree angles, to be specific.
great circle
a line
The point of intersection of a tangent line or plane with a circle on a sphere is the single point where the line or plane touches the circle. This point is unique because, by definition, a tangent line or plane only intersects a circle at one point without passing through it. If the tangent is from an external point, it signifies that the line or plane is just "touching" the circle at that specific location. In three-dimensional space, this concept illustrates the relationship between the geometry of the sphere and the properties of tangents.
Tangent
The intersection of a sphere with a plane is a point, or a circle.
A line. When two planes intersect, their intersection is a line.
A line.
an intersection
A line in Riemann's spherical geometry is called a great circle, which is the intersection of a sphere with a plane passing through its center. Great circles are the equivalent of straight lines in this non-Euclidean geometry.
A Vertex is the point of intersection, and a Perpendicular Vertex is a vertex with all 90 degree angles, to be specific.
great circle
a line
The coordinate plane is formed by the intersection of a vertical and a horizontal number line. What is the horizontal number line called?
Intersection
the back boundary line, and the long service line