An arc on a circle measures 85 degrees The measure of the central angle, in radians, is within which range?

A central angle has the same measure as its intercepted arc. Convert 85° to radians: 85 × π/180 = 17π/36, which is about 1.48 radians. This is between 0 and π/2, so the answer is B, 0 to π/2 radians.

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