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/inkscape/src/helper/
H A Dgeom-pathstroke.cpp726 Geom::Point der1 = derivs[1]; // first deriv (tangent vector) local
728 double l = Geom::L2(der1); // length
748 rad = -l * (Geom::dot(der1, der1) / Geom::cross(der1, der2));

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