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GENERAL AND ANGLE PROPERTIES OF GEOMETRIC FIGURES
Introduction
In this topic you will study angles on the straight line, parallel lines and angle properties of polygons. Equipped with the knowledge from this topic, you will be able to solve problems related with angle properties.
8.1 Classifying angles
An angle is the space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they meet. In geometry, angles are measured in degrees using a protractor.
8.1 Exercise Set
State whether each of the following angles is acute, obtuse or reflex.
8.2 Exercise Set
1. For each of the following angles, first estimate the angles and then measure the angle marked 0 to see how good your estimate was.
8.3 Exercise Set
8.4 Parallel and Intersecting Lines
When a line intersects (or crosses) a pair of parallel lines, there are some simple rules that can be used to calculate unknown angles.
3. Find the size of the unknown angles in the parallelogram shown in this diagram:
8.4 Exercise Set
8.5 Exercise Set
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