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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