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
It's a line... on a sphere...
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 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 line.
an intersection
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