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If the arc length is 8π cm and the radius is 16 cm, what is the central angle?

Answer and explanation

Correct answer: π/2

The governing relation for arc length is s = rθ when θ is measured in radians. Solving for the central angle gives θ = s/r. With s = 8π cm and r = 16 cm, θ = 8π/16 = π/2 radians. Therefore option B is correct. We can verify the result geometrically: π/2 is one quarter of a full revolution, and one quarter of a circle of radius 16 has arc length (1/4)(2πr) = (1/4)(32π) = 8π cm, exactly as given. If θ were π/4, the arc would be 4π cm; if it were π, the arc would be 16π cm; and 3π/2 would give 24π cm. Hence only π/2 satisfies the data.

Related tags

Arc LengthCentral AngleRadiansAnglesTrigonometric FunctionsMathematicsClass 12 Mcq

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