The formulas for horizontal curves (English units) are:
R = 5729.578/D T = Rtan(delta/2) and L = 100(delta/D)
R = radius (ft.)
D = degree of curve (DMS)
T = tangent length (ft.)
delta = angle between forward and back tangents (DMS)
L = length of curve (ft.)
Find T by subtracting the station...