Angle cap b has a measure between 0 degrees and 360 degrees and is coterminal with a negative 865 degrees angle. What is the measure of angle cap b ?

Coterminal angles differ by a whole number of 360-degree turns. Add 360 degrees three times to −865 degrees: −865 + 1,080 = 215 degrees. Since 215 degrees is between 0 and 360 degrees, angle b measures 215 degrees, choice C.

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