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How many degrees are 3π/4 radians?

Answer and explanation

Correct answer: 135°

For conversion from radians to degrees, use π radians = 180°, or multiply the radian measure by 180°/π. Thus (3π/4) × (180°/π) is the required calculation. The π factors cancel, leaving (3 × 180°)/4 = 540°/4 = 135°. Therefore option A is correct. A useful geometric check is that 3π/4 is three-fourths of π, and π radians represents a straight angle of 180°; three-fourths of 180° is 135°. Option B, 120°, corresponds to 2π/3 radians. Option C, 150°, corresponds to 5π/6 radians, while option D, 180°, corresponds to π radians. Cancellation of π before simplifying avoids confusing this value with nearby standard angles.

Related tags

Trigonometric-FunctionsAnglesRadian-To-DegreeClass-12Trigonometric FunctionsMathematicsClass 12 Mcq

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