Return the maximum error in length2() for the S1ChordAngle(x, y)
constructor, assuming that "x" and "y" are normalized to within the
bounds guaranteed by S2Point::Normalize(). (The error is defined with
respect to the true distance after the points are projected to lie
exactly on the sphere.)
Return the maximum error in length2() for the S1ChordAngle(x, y) constructor, assuming that "x" and "y" are normalized to within the bounds guaranteed by S2Point::Normalize(). (The error is defined with respect to the true distance after the points are projected to lie exactly on the sphere.)