PLZ HELP FAST PLZZZZ I DONT GET WHAT TO DO

PLZ HELP FAST PLZZZZ I DONT GET WHAT TO DO class=

Answer :

Answer:

The answer is 10! thank the person below me! :D

Answer:

Diameter is 10.

Step-by-step explanation:

The diameter of a circle is c/3.14. 31.4/3.14 is 10.