It's the square root of the square root of 81
Round to 
three... [DOC] [TLE] Square Root Calculator reduces any square root to simplest radical ... [PAR] The square root calculator below will reduce any square root to its simplest 
radical form as well as provide a brute force rounded approximation of any real or
... [DOC] [TLE] Square Root Day - Wikipedia [PAR] Square Root Day is an unofficial holiday celebrated on days when both the day 
of the month ... school teacher, created the first Square Root Day for September 9
, 1981 (9/9/81).