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BNC: 0 COCA: 44514

the measure of an angle at the centre of a circle opposite an arc (= part of the edge of a circle) that is the same length as the radius (= the line from the centre to the edge of the circle)弧度

BNC: 0 COCA: 44514
BNC: 0 COCA: 44514
BNC: 0 COCA: 44514

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