# Steve Breese

## Coordinate Geometry

I mapped a lot of parcels and property lines while employed as a GIS Analyst at the Forest Preserve District of DuPage County from 2005 until 2009.  Here are some Coordinate Geometry calculators that I developed in JavaScript to assist with my mapping.  For each problem, fill in all the purple boxes, click "Calculate", and the solution will appear in the pink boxes. Email Steve at [email protected] if you have questions, comments, or bugs.

### Extend/Trim a Line Extension X = Extension Y = X1 = Y1 = Trim X = Trim Y = Trim X = Trim Y = X2 = Y2 = Extension X = Extension Y = Extension/Trim Length = Slope (m) = Y Intercept (b) =

### Intersection of Two Lines Line 1-X1 = Line 1-Y1 = Line 1-X2 = Line 1-Y2 = Intersectinon - X = Intersection - Y = Line 2-X1 = Line 2-Y1 = Line 2-X2 = Line 2-Y2 = Line 1 Slope (m) = Y Intercept (b) = Line 2Slope (m) = Y Intercept (b) =

### Intersection of a Line with a Circle Start Point XA = YA = 1st Intersection XP1 = YP1 = Center of Circle XB = YB = Radius of Circle = 2nd Intersection XP2 = YP2 = End Point XC = YC = Azimuth of AC = Length of AB = Azimuth of AB = Intermediates (cont.)Angle BAC = cos BAC = quadratic formula-b = Intermediates (cont.) Length of AP1 = Length of AP2 =

### Intersection of Two Circles Center of Circle A XA = YA = Radius of Circle A = 1st Intersection XP1 = YP1 = 2nd Intersection XP2 = YP2 = Center of Circle B XB = YB = Radius of Circle B = Intermediates Azimuth of AB = Intermediates (cont.) Length of AB = Intermediates (cont.)Angle A =

### Create a Square Centroid - X = Centroid - Y = Corner 1-X = Corner 1-Y = Corner 2-X = Corner 2-Y = Corner 3-X = Corner 3-Y = Corner 4-X = Corner 4-Y = Area = Angle* = Intermediates Hypotenuse: Width/Height =

### Complete a Square Corner 1-X = Corner 1-Y = Corner 2-X = Corner 2-Y = Corner 3-X = Corner 3-Y = Corner 4-X = Corner 4-Y = Centroid - X = Centroid - Y = Lines 1-2,3-4 Slope (m) = Left Right Lines 2-3,3-4Slope (m) =

### Complete a Parallelogram Corner 1-X = Corner 1-Y = Corner 2-X = Corner 2-Y = Corner 3-X = Corner 3-Y = Corner 4-X = Corner 4-Y = Centroid X = Centroid - Y = Line 1-2 Slope (m) = Y Intercept (b) = Line 2-3Slope (m) = Y Intercept (b) =

### Complete an Equalateral Triangle Corner 1-X = Corner 1-Y = Corner 2-X = Corner 2-Y = Corner 3-X = Corner 3-Y = Centroid X = Centroid - Y = Line 1-2 Slope (m) = Y Intercept (b) = Line 2-3Slope (m) = Y Intercept (b) = Line 3-1Slope (m) = Y Intercept (b) = Left Right

### Law of Cosines Length A = Length B = Length C = Angle A = Angle B = Angle C =

### Create a Rectangle / Offset a Line Existing Line - Startpoint X = Existing Line - Startpoint Y = Existing Line - Endpoint X = Existing Line - Endpoint Y = New Line - Startpoint X = New Line - Startpoint Y = New Line - Endpoint X = New Line - Endpoint Y = Centroid - X = Centroid - Y = Offset/Width = Left Right Existing/New Line SlopeSlope (m) = Offset SlopeSlope (m) =