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Introduction to Practical Geometry

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notes

Introduction to Practical Geometry:

Practical Geometry is concerned with questions of shape, size, relative position of figures.

Geometrical tool:

To Draw circle, angle, or angle bisector we need to use some tools. We shall begin by listing these tools, describing them, and looking at how they are used.

Name

Figure

Description

Use

The Ruler A ruler ideally has no markings on it. However, the ruler in your instruments box is graduated into centimeters along one edge(and sometimes into inches along the other edge). To draw line segments and to measure their lengths.
The Compasses A pair – a pointer on one end and a pencil on the other. To mark off equal lengths but not to measure them. To draw arcs and circles.
The Divider A pair of pointers To compare lengths.
Set-Squares Two triangular pieces – one of them has 45°, 45°, 90° angles at the vertices and the other has 30°, 60°, 90° angles at the vertices. To draw perpendicular and parallel lines.
The Protractor A semi-circular device graduated into 180 degree-parts. The measure starts from 0° on the right-hand side and ends at 180° on the left-hand side and vice-versa. To draw and measure angles.
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