Civil Engineering PE

Answer: D - The length of the arc for the given curve is 42.76 feet.

Solution: Use the Horizontal Circular Curve formula

L = R x r (expressed in radians)

Where L = length of arc

R = radius = 245.00

r = central angle

Step 1: Convert angle from degrees into radians

Angle in radians = (angle in degrees) x Π/180

= (30.30 - 20.30) Π/180 = 0.1745 radians

Step 2: Determine length of arc

L = R x r

= 245.00 (0.1745) = 42.76 ft