Hello and welcome to NinetyEast. Today we're going to chat about angles. Angles are basically
a measure of how far something has turned or pivoted around a point. 
But why is this important? Why do we need to know about angles? Well we need to know about them for various reasons, including safety.
We need to know the incline of the roads ahead of us so that we can drive more safely;
pilots will use angles both for navigation and for making sure that we take off and land safely and comfortably.
They're also important for creating accurate tools such as analogue clocks.
There are many different angles, and we'll discuss them in the coming videos, but for now let's learn about the different components.
When two lines intersect they form an angle. The two lines are referred to as 'arms'; 
and the point of intersection or angle is referred to as the 'vertex'. 
We refer to the arms by their letters, describing the points at which they start and end. So this line for example, it starts at point A
and it ends at point B. So we'd call it 
AB
This line starts at point B,
and ends at point C. So we'd call this line BC.
The angle that's created by the intersection of these two lines is called ABC.
If a third line was to be added to the mix, then a  two more angles would be created;
and these ones would also be named in a similar fashion.
This one for example, would be BCA. And this one would be CAB.
You probably have noticed by now, but just in case you haven't, 
the letter that's in the middle is always the one that's the common point between the two lines. 
In our next video we're going to learn how to measure angles
using instruments like this. But for now you can check out the written tutorial for this video and if you've got any questions please don't hesitate 
to send us a message either directly through YouTube or send us an email to NinetyEastTV@gmail.com.
Thanks everyone!
