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Which is the radian measure of 270°?

Answer and explanation

Correct answer: 3π/2 radians

To convert a degree measure into radians, use radians = degrees × π/180. For 270°, the calculation is 270 × π/180. Reducing the numerical fraction by 90 gives 3/2, so 270° = 3π/2 radians. Hence option A is correct. The result can also be verified geometrically: 270° contains three right angles, and each right angle equals π/2 radians; therefore 3 × π/2 = 3π/2. Option B is π/2, the measure of 90°. Option C, 2π/3, equals 120°, and option D, 5π/4, equals 225°. Comparing the degree size with 180° also helps: 270° is one and a half straight angles, so its radian measure should be 1.5π, not a value smaller than π.

Related tags

Trigonometric-FunctionsAnglesDegree-To-RadianClass-12Trigonometric FunctionsMathematicsClass 12 Mcq

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