The distance between theoretical nose of crossing and actual nose of crossing for practical purposes, is

The distance between theoretical nose of crossing and actual nose of c

1.	The distance between theoretical nose of crossing and actual nose of crossing for practical purposes, is
A.	Nose thickness x tan α
B.	Nose thickness x cot α
C.	Nose thickness x sin α
D.	Nose thickness x cos α
Answer» C. Nose thickness x sin α