# Coordinate Geometry

**Traverse/Inverse**

Calculates the points around a traverse, using bearings, azimuths, field angles, curves, and spirals.

**Intersecting Lines**

Calculates solution(s) for the standard Bearing-Bearing, Bearing-Distance and Distance-Distance intersection methods.

**Spiral Intersection**

Calculates the intersection of a known spiral curve and an external point at either a known distance or a known bearing from the spiral.

**Area Calculation by Coordinates**

Calculates area of a parcel by direct entry of known coordinates. Can also be used to calculate cross-section areas.

**Area Calculation by Bearing and Distances**

Calculates area of a parcel from known bearings and distances of its legs, including circular curves.

**Area on Spirals**

Calculates approximate area between a spiral curve and its chord, either on centerline or at a known offset distance on either side of centerline, by stepping along the spiral at any desired length interval.

**Three Point Curve**

Calculates the radius and radius point (center of the curve) from three known points defined by their coordinates.

**Offsets**

Calculates centerline station and offset distances from a tangent, circular curve, or spiral curve, to any number of external points.