Circumference of a circle = pi • diameter
pi • 48 feet = 150.7964474 feet
Arc length = angle (in radians) • radius
Your angle is given in degrees. To convert it into radians, multiply by (pi/180)
Your angle in radians is: 1.832595715 radians
Back to the formula
Arc length = 1.832595715 • 24
Arc length = 43.98229715 feet