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Circular Curve Variables
transpo test 2
17
Engineering
Undergraduate 2
11/04/2008
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Term
PC =
 Definition
Point of Curvature (Beginning of curve)
Term
PT =
 Definition
Point of Tangency (End of Curve)
Term

PI =

Definition
Point of Intersection
Term
Δ =
 Definition
Central Angle
Term
L =
 Definition
Length of curve (PC to PT)
Term
l =
 Definition
length of arc (PC to P)
Term

Θ =

Definition
Central angle for arc length l
Term
T =
 Definition
Tangent Length (PC to PI & PT to PI)
Term
Φ =
 Definition
Deflection angle at PC between tangent and chord for P
Term
α =
 Definition
Deflection angle at PI between tangent and line from PI to P
Term
x =
 Definition
Tangent distance from PC to P
Term
y =
 Definition
tangent offset P
Term
D =
 Definition
Degree of curvature
Term
R =
 Definition
radius of curve
Term
E =
 Definition
External distance
Term
M =
 Definition
Middle ordinate
Term
C =
 Definition
Chord length
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