Translations:Sketcher CreateBSpline/4/en

''A B-spline curve made from 4 points (in white). Pictured are the control polygon in green (the straight lines connecting the red points), the weight circles in blue and the curvature comb in green. The (3) digit in the centre refers to the degree of the B-spline, and the (4) digits at the ends of the curve refer to their knot multiplicity.''