# What does Alpha-Gamma-Delta mean

### What is an angle

This is easy to explain using a flashlight as an example.

The beam of the flashlight is an overturned V. Inside the V there is light, outside it is dark.

The mathematician calls the "shape" of the flashlight one **angle**.

### Designations on the angle

The flashlight beam is limited on the sides. This is also the case with the angle.

These side lines are called at angles **leg**. The point at which these two legs meet is called **Vertex**.

To distinguish between different angles, they are denoted with Greek letters: for example **alpha** $$ alpha $$. This means the entire yellow area.

Sometimes you will see that angles are given by means of sequences of points.

Angle $$ alpha $$ $$ = $$ angle BAC (angle from B via A to C)

short: **$$ angle $$** $$ alpha $$ $$ = $$ **$$ angle $$**$$ BAC $$

The main Greek letters: **$$ alpha $$** = alpha **$$ beta $$** = beta **$$ gamma $$** = gamma **$$ delta $$** = delta **$$ epsilon $$** = epsilon

### Types of angles

Angles can be of different sizes. You can imagine this using the example of the clock. The two pointers are the legs of the angle.

At 1:00 a.m .: hands form small angles

At 4:00 am: the angle is already much larger

At 9:00 a.m .: the angle is even bigger

And at 12:00 a.m. or 12:00 a.m.?

There are 2 options:

The first picture shows you the largest possible angle on the watch. The second picture makes it clear to you that a so-called **Zero angle** exists.

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### How do you measure angles

You need a new one to measure angles **unit** and a new one **Measuring tool**.

The unit in which angles are measured is this

**Degree**and gets the mark**°**.As a measuring tool you take a

**triangle ruler**, because a "protractor" is drawn on it (yellow area).

### A special angle

You often come across the in your environment **right angle**: Table edges, cupboards, magazine pages ... The right angle is 90 °.

On the clock it looks like this:

You can display all angles between 0 ° and 360 ° on the clock.

### Types of angles

There are 3 special angle names:

$$ 1. $$ full angle = 360 °

$$ 2. $$ straight angle = 180 °

$$ 3. $$ right angle = 90 °

An exact number of degrees is assigned to these 3 types of angle. On the next page you will find the names for all other angle sizes.

##### Angles are marked with a small rotating arrow so that it is clear which area is meant:

or

The arrowhead is also often left out, so that only the arc remains.

### Other types of angles

$$ 4. $$ Acute angle = more than 0 ° and less than 90 °

$$ 5. $$ obtuse angle = more than 90 ° and less than 180 °

$$ 6. $$ obtuse angles = more than 180 ° and less than 360 °

Here you can also set the angle yourself:

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