This question is incomplete, here´s the complete question.
circular
circus
circumnavigate
circumference
circumstance
Based on the shared root, what is the common subject for all the words?
circles
navigation
geometry
shapes
Answer: circles
Step-by-step explanation:
Based on the shared root, the common subject for all the words is "CIRCLES".
-Circular: Something with a circle form.
-Circus: Customarily, circus tracks where the show is presented are circular spaces.
-Circumnavigate: Traveling around a place, usually refering to sailing around the world.
-Circumference: refers to the line surrounding a circular space.
-Circumstance: refers to the context that encompasses a specific event, person or thing.