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On a circular track of radius (63) m what is the distance covered for a central angle of (40^\circ)?

Answer and explanation

Correct answer: \(14\pi\) m

The arc-length formula is \(s=r\theta\), where \(\theta\) must be in radians. \(40^\circ=40\times\frac{\pi}{180}=\frac{2\pi}{9}\) radians. Therefore, \(s=63\times\frac{2\pi}{9}=14\pi\) m. Hence, \(14\pi\) m is correct. A nearby distractor such as \(16\pi\) m can result from an incorrect degree-to-radian conversion or multiplication. Exam tip: always convert the angle to radians before applying the arc-length formula.

Related tags

Trigonometric FunctionsArc LengthCentral AngleRadiansDegree ConversionCircular TrackAnglesMathematics

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