The name of the starting point when plotting points on a graph is called the point of origin. It is located on the point (0,0) or where the x and y axes meet.
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All of the points on a parabola define a parabola. However, the vertex is the point in which the y value is only used for one point on the parabola.
Circle.
Tangent
Vertex
A chordof a circle is a geometric line segment whose endpoints both lie on the circle. A secantor a secant line is the line extension of a chord. More generally, a chord is a line segment joining two points on any curve, such as but not limited to an ellipse. A chord that passes through the circle's center point is the circle's diameter.