radius, any straight line from the centre to the circumference , sector, a slice of the circle between two radii ( a pizza slice), circumference, the perimeter or curved side of a circle, arc, a section of the circumference, centre, the middle point inside the circle, diameter, any straight line from one side of the circle to the other that passes through the centre, quatrant, a sector ( pizza slice) that is 1/4 of the circle.

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