1.

In a regular cone, the angle between base and slanting surface is 60 degrees and the base diameter is 75 mm. If a helix is to be build on such a cone up to half of cones height with 6 revolutions in it. Pitch of the helix is?

A. 10.8
B. 5.4
C. 6.4
D. 12.9
Answer» C. 6.4


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