- arc length: =arc measure over 360 times 2piR
- area of equilateral triangle: 1/4(ssq'd)(rad3)
- area of regular polygon: 1/2ap
- area of sector: =arc measure over 360 times piRsq'd
- each int. angle of a polygon: (n-2)180 over n
- probability: successful outcomes over total outcomes
- sum of central angles of polygon: 360 degress
- sum of ext. angles of polygon: 360 degrees
- sum of int. angles of polygon: (n-2)180