We present a trigonometric scheme to approximate a

\r\ncircular arc with its two end points and two end tangents\/unit

\r\ntangents. A rational cubic trigonometric Bézier curve is constructed

\r\nwhose end control points are defined by the end points of the circular

\r\narc. Weight functions and the remaining control points of the cubic

\r\ntrigonometric Bézier curve are estimated by variational approach to

\r\nreproduce a circular arc. The radius error is calculated and found less

\r\nthan the existing techniques.<\/p>\r\n","references":null,"publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 97, 2015"}