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What is the coterminal angle of \(\frac{19\pi}{4}\) between (0) and \(2\pi\)?

Answer and explanation

Correct answer: \(\frac{3\pi}{4}\)

Coterminal angles have the same terminal side and differ by an integer multiple of a full turn, \\(2\\pi\\). To place \\(19\\pi/4\\) in the interval from 0 to \\(2\\pi\\), subtract one full turn: \\(19\\pi/4-2\\pi=19\\pi/4-8\\pi/4=11\\pi/4\\). This is still greater than \\(2\\pi=8\\pi/4\\), so subtract another full turn: \\(11\\pi/4-8\\pi/4=3\\pi/4\\). The result lies between 0 and \\(2\\pi\\), so option C is correct.

Equivalently, subtracting \\(4\\pi\\), which is two full turns, directly gives \\(19\\pi/4-16\\pi/4=3\\pi/4\\). Adding or subtracting full turns does not change the terminal side. The answer is not \\(\\pi/4\\), because that would require a different remainder, and it is not \\(5\\pi/4\\), which is larger than the calculated remainder. Thus, the supplied answer and explanation are mathematically consistent.

Related tags

Trigonometric-FunctionsCoterminal-AngleRadian-Measure

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