Angle M has a measure between 0° and 360° and is coterminal with a –620° angle. What is the measure of angle M?

Coterminal angles differ by a multiple of 360°. Add 720° (two full turns) to −620°: −620° + 720° = 100°. This is between 0° and 360°, so angle M measures 100°, choice A.

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