Geometric Constructions or Geometrical Constructions are mostly based on the basic simple geometry, though which is essential in the preparation of Engineering Drawings. Without having better knowledge and practice in Geometric Construction, it is very difficult to complete any kind of Engineering Drawing. The most commonly and generally used geometric constructions to construct any kind of engineering drawing are described below: (1) To draw perpendiculars of a given line. (2) To draw parallel lines. (3) To bisect or equally divide a given line into two parts. (4) To divide a line into any number of equal parts. (5) To bisect (Divide into two equal parts) an angle. (6) To divide a circle. (7) To trisect (Divide into three equal parts) an angle. (8) To draw an arc with a given radius. (9) To draw tangent and normal. (10) To draw a continuous curve. (11) To construct an ogee or reverse curve. (12) To draw a loop of three (3) circles pattern. [For simplicity, we'll discuss No.1 to No