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If kπ⁄18 radians equals 130°, what is the value of k?

Answer and explanation

Correct answer: 13

The governing concept is conversion between degrees and radians using the fundamental equivalence 180° = π radians. Convert 130° into radians: 130° × (π⁄180°) = 130π⁄180 = 13π⁄18 radians, after dividing numerator and denominator by 10. The given expression is kπ⁄18 radians, so comparison with 13π⁄18 gives k = 13. Therefore option C is correct. Alternatively, start with kπ⁄18 = 130° and multiply by 180°⁄π; this gives 10k = 130 and hence k = 13. If k were 10, 11, or 15, the corresponding angles would be 100°, 110°, or 150°, respectively, so those distractors do not satisfy the equality.

Related tags

Trigonometric-FunctionsRadians-DegreesAnglesConversionTrigonometric FunctionsMathematicsClass 12 Mcq

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