C1. The "Circle with Centre through Point" tool
Draw a circle centred on point "A" that passes through point "B"
You only need two clicks to draw it. In this activity you will learn to create dynamic texts. A text is an expression closed between double quotes, and has a very interesting property, you can add numbers in the texts.
1st. Activate the "Circle with Centre through Point" tool 
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2nd. Click on two different points in the Graphics View. You will see the centre "A", the point "B" through which it runs and the circle called "c".
3rd. Activate the "Move" tool 
and type into the Input Bar the command t1=FormulaText("Perimeter =" + Perimeter(c) + "cm") in order to know the perimeter of the circumference.
Texts also have a name in GeoGebra, this is called t1. The first term, "Perimeter =", closed into quotation marks, is a static text that indicates the name of the property you want to write. The second term, Perimeter(c), is dynamic and calculates the property. The third term, "cm", is also a static text that indicates the unit of measurement.
Activate the "Move" tool and move the points, you will check how the perimeter of the circle is constantly updated.
The two curved arrows located in the upper right corner of the Graphics View allow you to reset the activity.
If the activity is correct, you will get 10 points automatically.
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2nd. Click on two different points in the Graphics View. You will see the centre "A", the point "B" through which it runs and the circle called "c".
3rd. Activate the "Move" tool and type into the Input Bar the command t1=FormulaText("Perimeter =" + Perimeter(c) + "cm") in order to know the perimeter of the circumference.
Texts also have a name in GeoGebra, this is called t1. The first term, "Perimeter =", closed into quotation marks, is a static text that indicates the name of the property you want to write. The second term, Perimeter(c), is dynamic and calculates the property. The third term, "cm", is also a static text that indicates the unit of measurement.
Activate the "Move" tool and move the points, you will check how the perimeter of the circle is constantly updated.
The two curved arrows located in the upper right corner of the Graphics View allow you to reset the activity.
If the activity is correct, you will get 10 points automatically.