The area $A$ of the sector below is 140.28 (cm)^2. We wish to find the length of the radius, then the perimeter.

Find the length of the radius, $r$. (You may let \theta  represent the angle of the sector). Give your answer correct to one decimal place.
Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
Question: The area $A$ of the sector below is 140.28 (cm)^2. We wish to find the length of the radius, then the perimeter.

Find the length of the radius, $r$. (You may let \theta  represent the angle of the sector). Give your answer correct to one decimal place.
Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
Question: The area $A$ of the sector below is 140.28 (cm)^2. We wish to find the length of the radius, then the perimeter.

Find the length of the radius, $r$. (You may let \theta  represent the angle of the sector). Give your answer correct to one decimal place.