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Cartesian coordinate system
a method of locating points in the plane that uses pairs of numbers denoting distances along two fixed intersecting number lines, called axes
a planar geometric figure in which every point on the figure is the same distance from a point at the center
a property of real numbers that states that for any real numbers a and b, a + b = b + a and a x b = b x a
a polygon in which one or more interior angles have a measure greater than 180 degrees
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