line, can be extended endlessly, interior, the points inside the angle, line segment, starting and ending points are fixed, ray, one fixed point and one point extended endlessly, exterior, the points outside the angle, vertex, where the two arms meet in an angle, open curve, curves that do not end where they started, closed curve, curves that end where they started, simple curve, a curve that does not cross itself, plane, a flat surface that extends in all directions

geometry

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