This command locates a point on an arc. You can select an arc entity, an arc polyline segment or enter three points to define an arc. After the arc is defined, the screen preview arrow shows the occupied point and the distance to solve for is entered. The command then displays the curve information and locates/inserts a point symbol at the computed point. When prompted for the distance, use a positive value if the distance is from the 1st endpoint (PC the one highlighted by the screen preview arrow) and a negative value if from the 2nd endpoint (PT).
Define arc by, Points/<select arc or polyline>:
pick arc or polyline arc segment Pick a point on the arc
somewhere near it's midpoint. The preview arrow points to the 1st
endpoint.
Precede distance with minus sign if distance from 2nd
endpoint.
Distance along arc from 1st point: 100
The command then plots a point at the computed
distance.
Pulldown Menu Location: COGO > Interpolate Points
Keyboard Command: ptarc
Prerequisite: None