Circular circus circumnavigate circumference circumstance based on the shared root, what is the common subject for all the words? circles navigation geometry shapes

Based on the shared root, the common subject for all the words is CIRCLES.

-CIRCULAR: Something that has a circle form

-CIRCUS: A circus is an artistic show, usually itinerant, that is presented in a large tent that has tracks and seating galleries for the public. Circus tracks are usually circular areas where functions are presented.

-CIRCUMNAVIGATE: Circumnavigate is to travel around a place, be it an island, a continent, or the Earth. The term is usually referred to the navigation around the world.

-CIRCUMFERENCE: A circumference is a flat, circular and closed curve, so that all its points are equal distance from the center.

-CIRCUMSTANCE: A non-essential condition or characteristic that surrounds a person or thing and that influences them or facts related to them.

the answer should be monarchy

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