# 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) =