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For any circle in a plane, the ratio of circumference to diameter is a number called pi, approximately 3.14.
No.Circumference is the total distance around a plane figure. Usually a circle or ellipse.Diameter is the distance of a straight line from edge to edge passing through the centre of a circle.
A conic section is a curve formed by the intersection of a plane with a cone (conical surface). If the section is parallel to the base of the cone, the conic section has a fixed diameter and is a circle. Any other plane that does not intersect the apex is either a parabola, a hyperbola, or an ellipse.
You do a diameter circle!!
It is half of the diameter or radius = diameter/2