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If \(s=9\) cm and \( \theta=3 \) radians then what is the radius (r)?

Answer and explanation

Correct answer: 3 cm

The arc-length formula is \(s=r\theta\), where \(\theta\) must be in radians. Thus, \(r=\frac{s}{\theta}=\frac{9}{3}=3\) cm. Therefore, the correct answer is 3 cm. The option 27 cm results from multiplying \(s\) by \(\theta\), whereas finding the radius requires division. Exam tip: For arc-length questions, use \(s=r\theta\) only when the angle is in radians.

Related tags

Trigonometric FunctionsAnglesArc LengthRadian MeasureCircle RadiusMathematicsClass 12 Mcq

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