Angles as Rotation
We use the word angle for amount of turn. For example the figures below show the hands of a clock move between 12 ‘clock to 12 ‘ clock.
Both hands turn. In one hour the amount that each hand turns is different
The minute hand makes one complete turn, or one revolution
The angle turned = 1 revolution.
As we can measure length, we can measure angle. To avoid fractions, one revolution is divided into 360 equal parts. Each part is called a degree. We use the symbol 0 for degree.
1 revolution = 360 degrees or 3600
10 = 1/360 revolution
Angles between Lines
The figure below shows two lines AB and CB. The lines meet at the point B.
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