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180° is equal to how many radians?

Answer and explanation

Correct answer: π

The fundamental conversion relationship between degrees and radians is 180° = π radians. It follows from the definition of a radian: in a circle, a complete revolution is 2π radians and also 360°, so half a revolution is π radians and 180°. Therefore, 180° corresponds exactly to π radians, making option C correct. Option D, π/2, corresponds to 90°, while option B, 2π, corresponds to a complete 360° revolution. The number 1 is not the radian measure of a straight angle. Remembering the half-turn relationship is enough to convert many standard angles accurately.

Related tags

TrigonometryAnglesRadian-MeasureConversionTrigonometric FunctionsMathematicsClass 12 Mcq

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