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If θ = 38°45′, what is its complementary angle?

Answer and explanation

Correct answer: 51°15′

The governing fact is that complementary angles have a sum of 90°. Therefore the required angle is 90° − 38°45′. Because the minutes cannot be subtracted directly from zero, rewrite 90° as 89°60′. Now subtract degrees and minutes separately: 89°60′ − 38°45′ = 51°15′. Hence option A is correct. The result can be checked by addition: 38°45′ + 51°15′ = 89°60′ = 90°. Option B reflects an incorrect borrowing step, option C mishandles the degree-minute conversion, and option D has the wrong number of minutes. Correct treatment of 60 minutes per degree makes the answer unique.

Related tags

Complementary-AnglesDegrees-MinutesAngle-SubtractionGrade-12AnglesTrigonometric FunctionsMathematicsClass 12 Mcq

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