This command draws a curve from a perpendicular tangent line with a known radius and arc length. It prompts for the radius, the arc length and then to pick the P.C. start point of the curve (endpoint of previously drawn tangent line) and a point along the tangent line.
Precede radius with - sign for curve to the left.
Radius of Arc <15.00>: 55
Arc Length <25.00>: 30
PC Start Point ?
Pick point/<point Number>: 14
PtNo. North(y) East(x) Elev(z) Desc
14 4869.06 4390.3 10.00
[nea on] Pick point along perpendicular tangent line: pick a
point on tangent line
Radius Point Coordinates: (4355.2 4911.4 0.0)
Pulldown Menu Location: Draw > Arc
Keyboard Command: sral
Prerequisite: Tangent lines should be drawn before
execution