Hi, thank you for posting your question here at Brainly.
When the performer completes a full circle, he has travelled the whole perimeter of the circle. Then,
15*Perimeter = total distance
15*Perimeter= speed*time
15*P = 1.5 m/s * 3 minutes
3 minutes is equivalent to 180 s
P = (1.5*180)/15
P = 18 m = d