Mohammad S. answered • 12/20/20
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A professor with over 20 years of teaching/tutoring experience
490, the only coterminal in the given range is 490 - 360 = 130 degrees. for its reference angle, 490 falls in the second quadrant (130 degrees), and accordingly, its reference angle is 180° minus our given angle which is 180 - 130 = 50 degrees.
-70, the only coterminal angle in the given range is -70 + 360 = 290 degrees. -70 falls in the fourth quadrant (equivalent to 290) and our reference angle is 360° minus our given angle which is 360 - 290 = 70 degrees.
