I need help what is the correct awnser radius and diameter

Answer:
Hi! Here is what I have: r=10.6 and d= 21.2
Step-by-step explanation:
1: Multiply your radius by 2 so (10.6 x 2)
2: Get your answer which is 21.2 (from the calculator)
3: The first choice is the correct answer.
Hope this helps!