a straight line that joins two points on the circumference of a circle or the ends of an arc

arched, rounded line or object

a line of which no part is straight, e.g. part of the edge of a circle

arched, rounded line or object

a regular oval

circuit, revolution

a curve of two equal parts formed by cutting through both bases of a double cone

arched, rounded line or object

a path followed by a heavenly body, e.g. a planet, or by a man-made object, e.g. a satellite, round another body

circuit, revolution

a flat curve formed by cutting a cone along a line parallel to its side

arched, rounded line or object