I really need help plz!:)

A of a circle=Pi*radius squared
Radius is half of the diameter
2/2=1
Radius=1
1 squared is 1
1*3.14=3.14
3.14 units squared
Answer: 6.28318530718 or 6.28
Step-by-step explanation:
[tex]2\pi = 6.28[/tex]
* Hopefully this helps:) Mark me the brainliest:)