Tangent-Tangent Intersections

Intersecting Curves (arcs)

Tangent-Tangent IntersectFor the example on the right, TPC computed tangent intersects at both ends of the red tangent line.

Here is the dialog used to compute this example.

Tangent Intersect Dialog

When you select a curve for either Point 1, Point 2 or both, TPC limits the possible intersections to the length of that curve. In the example shown above, INT1R was restricted to the arc between 3PC and 3PT. INT2R was restricted to the arc between 7PC and 7PT.

This restriction is common in surveying because you want the intersections to fall on existing survey lines.

You can remove this restriction by turning on the [x] Accpet intersects beyond ends of the line.

Intersecting Circles

Tangent-Tangent intersect of two circlesFor the example on the right, we have computed intersects 20' from PR1 and 40' from PR2.  We've drawn the resulting circles around both PR1 and PR2. The tangent intersects must lie on these circle.

Without the restriction of an existing survey line, TPC can compute two intersections on each circle, using L for Left and R for right.

Here is the dialog used to compute this example.

Tangent Intersect Dialog

Editions

Premium, Professional

Related Topics

Creating Points at Tangent Intersections
Using COGO
COGO Commands