The arc length formula is:

Where
θ is the angle
r is the radius
Given,
θ = 75°
r = 15
Now, we find the arc length (L) of Arc AC by substituting the information we know [ Remembering to use 3.14159 as π ]:

Rounding to the nearest thousandth (3 decimal places), we have:
Arc Length = 19.635 units