I WILL GIVE 20 POINTS TO THOSE WHO ANSWER THIS MATH QUESTION RIGHT NOOOO SCAMS PLEASE AND PLEASE EXPLAIN WHY THAT IS THE ANSWER

Answer:
4.7 inches
Step-by-step explanation:
I believe the answer is 4.7 inches. Use pi * diameter to find the circumference, then multiply the circumference by 1/10 to find the outer perimeter of frosting for one slice of cake. Round that number to the nearest 10th.