the trace of a point whose direction of motion changes

ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point

a plane figure bounded by two radii and the included arc of a circle

forming or resembling an arch

form an arch or curve

the graduated arc that is attached to an instrument for measuring angles

ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point

a plane figure bounded by two radii and the included arc of a circle