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DIAGRAMS
&
EQUATIONS
CIRCUMFERENCE OF A CIRCLE
C = 2πr = πd
c = Circumference
r = Radius
d = Diameter
Ï€ = 3.14159
CIRCUMFERENCE OF AN ELLIPSE
R = larger radius
r = smaller radius
C = (R + r)Ï€
CIRCUMFERENCE OF AN ARCH
CL = Chord Length
CH = Chord Height
L = Arch Length
OR = Outside Radius
IR = Inside Radius