Edexcel IGCSE Maths 复习笔记 4.3.1 Bearings & Scale

What are bearings?

• Bearings (sometimes referred to as three-figure bearings) are a way of describing and using angles
• The way they are defined means it gives us a precise location and/or direction which means they have good uses in navigation

Bearings have 3 rules:

1. They are measured from the North directionNorth is usually straight up in terms of a scale drawing or map drawn on a piece of paper and should be shown somewhere on the diagram
2. They are measured clockwise (from North)If you get muddled up look at a clock on the wall
3. The angle should always be written (said) with 3 figuresSo angles under 100° should have zeros to start, eg 059, 008

   Notice also that the degree symbols are not usually included when talking about bearings