The radius is one-half of the diameter. Leave your answer in terms of for the exact answer. Use whatever approximation for that your text or instructor has told you to use if you want a numerical approximation. If you do a numerical approximation, it should be rounded to the nearest square foot. That is because your least precise given measurement was given to the nearest foot (at best).
John
Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it
