1
Q
Circumference
A
C = πd
2
Q
Arc Length
A
S = 2πr(θ/360°)
3
Q
Area of a Circle
A
Acircle = πr2
4
Q
Area of a sector
A
Asector = πr2(θ/360°)
5
Q
Area of a segment
A
Aseg = Asector - Atri
6
Q
Area of a Lune
A
Alune = (Asector1 - Atri1) - (Asector2 - Atri2)
