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In this paper; the pitch, the angle of pitch and the dual angle of pitch of ruled surface in ℝ3 which is corresponded to a closed curve on dual unit sphere are investigated. This closed curve is formed by the vectors of Frenet and Bishop frame of a closed curve on dual unit sphere. Also the relation between dual angle of pitch and pitch, angle of pitch is obtained.
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Güven et al. (2011) studied this question.
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