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In a circle the arc length is equal to the radius. What will be the angle at the centre?

Answer and explanation

Correct answer: \(1\) radian

For an angle measured in radians, \(\theta=\frac{s}{r}\), where \(s\) is the arc length and \(r\) is the radius. Here \(s=r\), so \(\theta=\frac{r}{r}=1\) radian. \(\pi\) radians represents a semicircle, so it is not correct here. Exam tip: For arc-length questions, first use \(\theta=\frac{s}{r}\).

Related tags

Trigonometric FunctionsAnglesRadiansArc LengthCentral AngleMathematicsClass 12 Mcq

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