# Geometrical Constructions

Introduction

Engineering drawing consists of a number of geometrical Constructions. A few methods are illustrated here without mathematical proofs.

1.      To divide a straight line 65 mm into a given number of equal parts say 5

Solution

1. Draw a line of 65 mm with Command L

2. Name the Line With Text Command A,B

3. To Divide line Type Command DIV Enter

4. Select Object To Divide Select Line

5. Enter the Number Of Segment of 5 Enter

6. Select Point Style from utilities to show divisions.

2.      To bisect a given angle 900

Solution

1. Draw a line of 50 mm with Command L Name the Lane With Text Command A,B

2. Draw another Line 50 mm From the End of Previous Line with 900 Angle with Command

L name the Line With Text Command B,C

3. To Bisect Line Type Command XL press enter

4. Select Bisect Option or Enter B and specify angle vertex point at End Point.

5. Specify Angle Starting Point

6. Specify angle end point enter

7. Mention Angle After Bisection

Polygons

1. To construct a regular polygon (say a pentagon) given the length of the side 5(EDGE

METHOD)

Solution

1. To construct any polygon Enter Command POL

2. Enter No of Sides 5

3. Specify Center pf Polygon or Edge enter Command E

4. Specify First End Point of Edge & Specify second End Point of Edge by entering specific

Distance 5

5. Name the Edges With text Command TEXT

2. Inscribe a hexagon in a given circle of 50 mm Diameter (Inscribe Circle Method)

Solution

1. To construct any polygon Enter Command POL

2. Enter No of Sides 6

3. Specify Center pf Polygon or Edge enter select Center

4. Enter an option with Inscribed in Circle with command I

5. Specify radius Of Circle with 50

6. Name the Edges With text Command TEXT