If L is length of a rail and R is the radius of a curve, the versine h for the curve, is

If L is length of a rail and R is the radius of a curve, the versine

1.	If L is length of a rail and R is the radius of a curve, the versine h for the curve, is
A.	a = l/4r
B.	a = lÂ²/4r
C.	h = lÂ²/8r
D.	h = lÂ²/16r
Answer» D. h = lÂ²/16r