AutoCAD 2D_I

Module 2: Geometric Constructions

Module Objectives:

1. Draw and bisect a straight line using a compass.2.Draw and divide a straight line into any number of equal parts using3.a compass.4. Bisect any angle between two straight lines without the aid of a protractor.5.Construct a hexagon given the length of one side.6. Construct a tangent to a point on a circle.7.Construct a common tangent to two circle.8.Construct radii to blend with curves and straight lines.

Introduction

Introduction

“Construction" in Geometry means to draw shapes, angles or lines accurately.These constructions use mainly compass,straightedge (i.e. ruler) and a pencil.This is the "pure" form of geometric construction where no numbers are involved.While drawing these constructions, you need to use a sharp medium-hard lead (H to 3H).Draw construction lines extremely light and allmain lines medium to thin but dark.

Geometric Constructions by using a compass

Geometric Constructions by using a compass

Bisecting a Straight Line

Bisecting an Angle

Constructing a regular hexagon given one side

length.

Tangency

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Practical Tasks

Practical Tasks

Class Activities HomeWorks

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Supplementary resources

Supplementary resources

1. http://www.mathopenref.com/consthexagon.html

2. http://www.mathsisfun.com/geometry/constructions.html

The End