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If arc \(s=11\pi\) cm and angle \( \theta=\frac{\pi}{2} \) radians, what is the radius?

Answer and explanation

Correct answer: 22 cm

When the angle is in radians, the arc-length formula is \(s=r\theta\). Thus, \(r=\frac{s}{\theta}=\frac{11\pi}{\pi/2}=11\pi\times\frac{2}{\pi}=22\) cm. The option \(22\pi\) cm is incorrect because the \(\pi\) terms cancel. Exam tip: Use this formula directly only when the angle is measured in radians.

Related tags

Trigonometric FunctionsAnglesArc LengthRadian MeasureCircle RadiusMathematicsClass 12 Mcq

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