To see 81 degrees from different powers of 10:
1) Temperature (10+2)
81 degrees Fahrenheit = 27.2 degrees Celsius
2) Global location (10+7)
81 degrees longitude (vertical line) = 81 degrees west of the Prime Meridian (Greenwich, England)
3) Weather (10+4)
The dewpoint is always the same as the temperature or lower. During a heat wave in a humid climate, the dewpoint can climb to over 80 degrees and the air will feel start to feel thick and heavy.
4) Angle (10+2)
There are 360 degrees are in a circle. Since 81 degrees is less than 90 degrees, it is an acute angle.