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Convert 12°45' into decimal degrees.

Answer and explanation

Correct answer: 12.75°

The governing conversion is based on the fact that one degree contains 60 minutes. The apostrophe indicates minutes, so 45' must be converted by dividing by 60, not by treating 45 as a decimal digit. Thus 45 minutes equals 45/60 degree, which is 0.75°. Adding this fractional part to the whole-degree measure gives 12°45' = 12 + 45/60 = 12 + 0.75 = 12.75°. Therefore option B is correct. Option A incorrectly uses 0.25° for the minutes, option C reflects an inaccurate conversion, and option D makes the minute contribution too large. The same method works for any degree-minute conversion: divide the minutes by 60 and then add the result to the degree value.

Related tags

TrigonometryAnglesDegree-Minute-ConversionTrigonometric FunctionsMathematicsClass 12 Mcq

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