Step 1: Note down the given values

Step 2: Set up the formula for arc length. 

NOTE: The formula is arc length (s) = \frac{\theta}{360} *C

Where, s = Arc length

            C = Circumference

             \theta = Central Angle

Step 3: Plug the circumference of the circle into the formula.

Step 4: Plug the value of the arc’s central angle into the formula. 

Step 5: Simplify the equation to find the arc length

NOTE: Use multiplication and division to simplify the equation.

EXAMPLE: arc length (s) = \frac{\theta}{360} *C

                                        =  \frac{105}{360}*20

                  Arc\ lengths=5.8333