General:

Each angle in a triangle ABC fx has a name (Applicable for all shapes / polygons).
Normally it is enough that the cold ones angle A, angle B and angle C.
But you can also cool angle A to angle CAB, angle B to angle ABC and C angle for angle BCA. (Se billedet øverst)
It's all here on, that bogstavet, which are in the middle (fx CAB) to be the angle, one would describe or measure (angle A) .
In GeoGebra you can measure, How many degrees is an angle using. værktøjet ‘Vinkel’ .

How to do:

Once you have constructed such a triangle, then do the following:

1. Press ‘Angle‘-knappen.
2. You now have 2 options:
   1. Goal inner angle – pressure clockwise.
   2. Measure outer angle – pressure anticlockwise.
3. See description below.

Internal angle

You must press clockwise.
In order to obtain the size of the angle A, then you, som vist på billedet, press -knappen og derefter på punkterne CAB.

Outer angle

You must press anticlockwise.
For at finde størrelsen på vinkel B’s ydre vinkel, then you, som vist på billedet, press -knappen og derefter på punkterne CBA.

Video