A pair of parallel lines, an ellipse or a circle.
The common point is called the intersection.
A Vertex is the point of intersection, and a Perpendicular Vertex is a vertex with all 90 degree angles, to be specific.
Tangent
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. When two planes intersect, their intersection is a line.
Definition: a tangent is a line that intersects a circle at exactly one point, the point of intersection is the point of contact or the point of tangency. a tangent is a line that intersects a circle at exactly one point, the point of intersection is the (point of contact) or the **point of tangency**.
locus * * * * * A more likely answer is "the centre of the circle".
A pair of parallel lines, an ellipse or a circle.
A line.
an intersection
The common point is called the intersection.
A Vertex is the point of intersection, and a Perpendicular Vertex is a vertex with all 90 degree angles, to be specific.
Tangent
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?