Radians
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Which of the following describes an angle of \(1\) radian?
\(\text{The angle at the centre subtended by an arc equal in length to the diameter}\)
\(\text{The angle at the centre subtended by an arc of length }1\text{ cm}\)
\(\text{One three-hundred-and-sixtieth of a revolution}\)
\(\text{The angle at the centre subtended by an arc equal in length to the radius}\)
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