[size=200][b]Draw a circumference centered on point "A" with 2 radio units[/b][/size][br][br][color=#000000]You will be taken to create another dynamic text. A text is formed by an expression enclosed in double quotes. They have a very interesting property, you can join numbers in the texts with the sum.[/color][br][br][color=#9900ff]1st. Activate the "Circumferencia donadas el centro y el radio"[icon]/images/ggb/toolbar/mode_circlepointradius.png[/icon]tool. A radius call dialog window appears.[/color][br][br][color=#9900ff]2nd. Type [color=#000000][b]2[/b][/color] and then the "[color=#000000][b]OK[/b][/color]" button. The circumference will appear with 2 radio units.[/color][br][br][color=#9900ff]3rd. Activate the "Move" [icon]/images/ggb/toolbar/mode_move.png[/icon]tool, and in the "[color=#000000][b]Input:[/b][/color]" zone, enter the command to know the area of ​​the circumference. [color=#000000][b]t1 = FormulaText("Area =" + Area(c) + "cm^2")[/b][/color][/color][br][br][color=#000000]The first sum, [color=#000000][b]"Area ="[/b][/color], is enclosed in quotation marks, is a static text that indicates the name of the property, the second sum, [color=#000000][b]Area(c)[/b][/color], calculates the property, is the dynamic part of the text and the third sum, [color=#000000][b]"cm^2"[/b][/color] is also a static text that indicates the unit of measurement. The circumflex accent, [color=#000000][b]^[/b][/color], is used to indicate in GeoGebra that behind there is an exponent.[/color][br][br][color=#000000]The two curved arrows located in the upper right corner of the Graphics View allow you to reset the activity.[/color][br][color=#000000]If the activity is correct, you will get 10 points automatically.[/color]