A) \[22.5{}^\circ \]
B) \[45{}^\circ \]
C) \[67.5{}^\circ \]
D) \[90{}^\circ \]
Correct Answer: C
Solution :
Helix angle, \[\alpha =90{}^\circ -\]lead angle, \[\gamma \,\,90{}^\circ -22.5{}^\circ =67.5{}^\circ \]
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