Definition from macmillandictionary.com
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a mathematical calculation to find out the radius of a circle
Cut out a circle of paper.
a circle of stones
The dancers were standing in a circle around the fire.
Now I’d like you to form a circle and hold hands.
They have a large circle of friends and acquaintances.
I soon became a member of her social circle.
He now felt he was a member of the family circle.
He began to move in the scientific circles centred round Sir Charles Cavendish.
The bank’s failure sent shock waves through international financial circles.