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In a circle of radius (14) cm the central angle is \(\frac{3\pi}{7}\). What is the arc length?

Answer and explanation

Correct answer: \(6\pi\) cm

Since the central angle is given in radians, use the arc-length formula \(s=r\theta\). Here, \(r=14\) cm and \(\theta=\frac{3\pi}{7}\). Thus, \(s=14\times\frac{3\pi}{7}=6\pi\) cm. \(7\pi\) cm would result from incorrect simplification of the product. Exam tip: In \(s=r\theta\), the angle \(\theta\) must be in radians.

Related tags

Trigonometric FunctionsArc LengthRadian MeasureCentral AngleCircle GeometryAnglesMathematicsClass 12 Mcq

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