High Quality Content by WIKIPEDIA articles! The quadrifolium (also
known as four-leaved clover) is a type of rose curve with n=2. A
Cartesian coordinate system specifies each point uniquely in a
plane by a pair of numerical coordinates, which are the signed
distances from the point to two fixed perpendicular directed lines,
measured in the same unit of length. Each reference line is called
a coordinate axis or just axis of the system, and the point where
they meet is its origin. The coordinates can also be defined as the
positions of the perpendicular projections of the point onto the
two axes, expressed as a signed distances from the origin.
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