Calculating Radius of a Curve
Two points define a straight line. But 3 points define a curve.
Given the distance from point A to B and the distance from B to C
and the distance from A to C, this program calculates the radius
of the curve defined by those 3 points. It uses the law of cosines
to find the dimensions of two right triangles defined by the points,
and from them, the distance to the radius center.
Enter the dimensions described in the photo. WARNING: Measurements
must be extremely accurate! A small error in any measurement will
cause a large error in the result. Hint: Drive a small finishing
nail into each stake. Use these nails as an exact point of reference.
The radius derived from this program can be used to build track
panels to fit the curve.
Note: All units must be the same. (feet, inches, meters, whatever)
