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What is the angle between (0) and (2\pi) for (-\frac{29\pi}{5})?

Answer and explanation

Correct answer: ( \frac{\pi}{5} )

The answer is option A, pi/5. Angles that differ by a full turn, 2pi radians, have the same position. The given angle is -29pi/5. Add 2pi=10pi/5 repeatedly until the result lies between 0 and 2pi. First, -29pi/5+10pi/5=-19pi/5; second, -19pi/5+10pi/5=-9pi/5; third, -9pi/5+10pi/5=pi/5. This lies between 0 and 2pi, so it is the required coterminal angle. Option A, pi/5, is correct. Option B, 3pi/5, would differ from the given angle by 32pi/5, which is not an integer multiple of 2pi. Option C, 7pi/5, and option D, 9pi/5, also do not result from adding whole turns to the given angle. A shorter calculation is -29pi/5+30pi/5=pi/5. Always check that the final answer is in the interval 0 to 2pi.

Related tags

Trigonometric-FunctionsAnglesRadian-Range

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