Provide your best answer for the following math problem. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The problem is: what is the measure of the radius of the circle that circumscribes a triangle whose sides measure 11 , 60 and 61 ?
30.5
20.51 (rounded to two decimal places)