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The geometrical constructions are used in engineering drawings which are often necessary to make certain geometrical constructions in order to complete an outline drawing.

Symbols of Surface Finish and Scales of sheet Sizes

**Parallel Lines**

- Draw a line parallel to a given line at a distance from the first point of line.
- Draw a line parallel to a given line through a given point of line
- To divided a line into any number of equal points.

**Perpendicular Lines**

- Draw a perpendicular line from the end of a given line
- Draw a perpendicular line from the point in a given line (To select wherever on the line )
- Draw a perpendicular line from the point outside a line.

**Angle**

- To construct an angle equal to a given angle.
- To construct a trisect right angle.
- To bisect a given angle.

## Regular and Tangential Geometrical Constructions

The Regular and Tangential geometrical Constructions which are based on the lines intersects with arcs, various lines through the given segments.

- To construct a regular hexagon on a given line.
- To construct a regular Pentagon on a given line.
- To draw a heptagon on a given line with a regular polygon.
- Draw an arc tangential to a given centers, arcs on opposite sides.
- Draw an arc tangential to two arcs and enclosing one of them.
- To draw arcs tangential to a given arc, with centers on the same side.
- Draw a curve tangential to three intersecting lines.
- To draw an arc tangential to two arcs (which are pointed in a externally)
- To draw an arc tangential to two arcs (which are pointed in a internally)
- Draw an arc tangential to two straight lines at right angles.
- Draw an arc tangential to two straight lines.
- To draw an arc tangential to a line and another arc.
- To draw a direct common tangent to two given circles
- To draw a tangent to a circles from an outside point.

- Types of lines and How to Understand the lines in Engineering Drawing.
- How to Calculate the Hole Tolerance and Shaft Tolerance with following the three pairs.
- Types of Dimensioning Methods and How to Understand Them.
- What are the Drawing instruments and How to use them.
- What is The System of Fits and Basis System.