We first need to convert 39°14'55" to decimal degrees.....this can be done as follows :
39 + 14/60 + 55/3600 ≈ 39.24861°
a. radian value = 39.24861 * pi / 180 ≈ .685 rads
b. arc length = radius * [radian measure of the central angle ] =
375 * [ .685 ] = 256.875 ft = 256 + 7/8 ft