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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. 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?
In the co-ordinate plane The horizontal number line is the 'x-axis'. The vertical number line is the y-axis. They intersect at the 'origin' ; coordinate (0,0) In the 3-dimensional system there is a third number line going from front to back , this is the z-axis. All three axes intersect at the origin , and have the the coordinates ( x,y,z) = (0,0,0)