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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.
This is the British English definition of circle. View American English definition of circle.
someone who studies the stars and planets using scientific equipment including telescopes