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If \(\theta=4\) radians and \(r=7\) cm then what is the arc length (s)?

Answer and explanation

Correct answer: 28 cm

For a central angle measured in radians, the arc-length formula is \(s=r\theta\). Thus, \(s=7\times4=28\) cm. The value 14 cm is only twice the radius; arc length must also be multiplied by the angle \(\theta\). Exam tip: use \(s=r\theta\) directly only when \(\theta\) is in radians.

Related tags

Trigonometric FunctionsAnglesArc LengthRadiansCircle GeometryMathematicsClass 12 Mcq

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