Glossary angular coordinate the angle formed by a line segment connecting the origin to a point in the polar coordinate system with the positive radial ( x) axis, measured counterclockwise cardioid a plane curve traced by a point on the perimeter of a circle that is rolling around a fixed circle of the same radius the equation of a cardioid is or limaçon the graph of the equation or If then the graph is a cardioid polar axis the horizontal axis in the polar coordinate system corresponding to polar coordinate system a system for locating points in the plane.
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