Using the formula:

Which is, 3.14 x 2^2 (radius is half of diameter)
Which equals 12.56.
It's a source citation. The name Breenan is the author, and 142 is probably the page this information was found on in Breenan's writing.
Answer:
Hope I helped
Explanation:
In my school it would be considered true. Hope I could help
It most likely probably isn’t