The formula for arc length is s = r * theta, where theta is the central angle
in radians (not degrees).
Converting that 6° central angle to radians,
pi rads pi rads
(6°) * ------------- = -------------- = 0.1047 rads
180° 30
Then the arc length here is s = r * theta, or s = (8 ft)(0.1047 rads) = 0.838 ft