Provide an appropriate response.
A piece of round steel is milled to a point at one end. The angle formed by the point is the angle of taper. If the steel has a 22-mm diameter and a 60° angle of taper, find the length c of the taper. 
A. 19.1 mm
B. 11 mm
C. 22 mm
D. 21 mm
Answer: C
Mathematics
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