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If arc \(s=18\) cm and angle \( \theta=\frac{3}{4} \) radians, what is the radius?

Answer and explanation

Correct answer: 24 cm

When the angle is in radians, the arc-length formula is \(s=r\theta\). Therefore, \(r=\frac{s}{\theta}=\frac{18}{3/4}=18\times\frac{4}{3}=24\) cm. Hence, option C is correct. Option D may result from multiplying \(18\) by \(\frac{3}{4}\), but finding the radius requires division by \(\theta\). Exam tip: In arc-length questions, first check that the angle is expressed in radians.

Related tags

Trigonometric FunctionsAnglesArc LengthRadian MeasureCircle RadiusMathematicsClass 12 Mcq

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