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An Angle on Geometry

An introduction to geometry, angles, triangles, and other 2D shapes.

An Angle on Geometry by Jane Bourke
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This book is designed to complement the geometry component of the space strand of the curriculum. It provides a basic introduction to new concepts as well as activities that will consolidate the skills and ideas associated with introductory geometry.

The book is designed to be used sequentially as certain skills need to be mastered in order to complete some of the later activities. Many of the activity pages explain the various mathematical concepts and provide examples, however, it is assumed that these ideas will be discussed in class prior to students completing the worksheets.

The activities in this book cover the major learning areas such as identifying different types of angles, using a protractor to measure angles, using known rules to calculate the size of angles, and constructing angles using either a compass or a protractor.

Angles in a wide range of 2D objects are explored, specifically, the angles of scalene, isosceles and equilateral triangles, parallel and intersecting lines, and angles in a circle. In addition, there are several pages that apply many of these concepts to angles in everyday situations.

The book also explores the mathematics of circles examining features such as chords, arcs, angles, and various shapes in circles.

Ready-Ed Publications; June 2000
44 pages; ISBN 9781863972277
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Title: An Angle on Geometry
Author: Jane Bourke

Measuring Angles 1

Angles are measured in degrees. This is usually
expressed with this symbol °. A protractor
is used to measure angles.
Using a protractor follow the example
below and then complete the activities.

(Note: the book includes appropriate diagrams)

To measure an angle:

1. Place the center of the protractor on the corner or sharpest point (vertex) of the angle.

2. Turn the protractor so that the base line runs along one of the lines that forms the angle.

3. You can then read the size of the angle from the position of the second line. For example this angle is approximately _______°

Measure the angles below and write down the type of angle for each one, e.g. acute, obtuse, or right.