Written theory

An angle is formed from two straight lines, called rays. The two rays that make an angle are called arms. And they share the same endpoint. This endpoint is called the vertex of the angle. The angle is labelled with a capital letter.

Now we have already seen the most important angle in math. The right angle. This angle is made when two arms are perpendicular. And the angle they make is 90 degrees.
In the picture below you can see the 5 types of lines you’ll need to know.
It is important to know that: