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a mathematical calculation to find out the radius of a circle
Cut out a circle of paper.
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.
He’s back managing the club he first started out in, so his career has come full circle.
We talked for hours, but we were just going round in circles.
This is the British English definition of circle. View American English definition of circle.