How to reach the area and circumference of a circle in GeoGebra can be done in several ways.

Construct the circle first

1. Construct the first circle using. eg 'circle out from the center and point'--button.
2. Press 2 places on the drawing pad.
3. Thus you have now 1 circle on the drawing pad, which is made from 2 points A and B.

Method #1 – Input field

Area

1. In the input field, start typing area …
2. Now select the area[ <Polygon> ]
3. Pressure circle name / letter

   Area[c]

4. Press Enter on your keyboard.
5. In Algebra window is now through variable a, what area is.

Circumference

1. In the input field, start typing circumference…
2. Now select the Circumference[ <Conic> ]
3. Pressure circle name / letter

   Circumference[c]

4. Press Enter on your keyboard.
5. In Algebra window is now through the variable b, what is the circumference.

Method #2 – Toolbar

Area

1. Select the tool area--button.
2. Press the circle periphery.
3. Now the area of ​​the circle on the drawing pad.

Circumference

1. Select the tool length--button.
2. Press the circle periphery.
3. Now the circumference of the circle on the drawing pad.

Test

Now try to pull the point A or point B. Notice, what happens to the circle area and perimeter.

Video