option 1: "Draw the 3 of a triangle. What do you see?"

Follow the steps:[br][table][tr][td]stap 1   [/td][td][icon]/images/ggb/toolbar/mode_polygon.png[/icon][/td][td]Select the [i]Polygon [/i]tool and clik 3 times in the graph to create the vertexes A, B and C. [br]Click again on the first point A to close the triangle.[/td][/tr][tr][td]stap 2[/td][td][icon]/images/ggb/toolbar/mode_orthogonal.png[/icon][/td][td]Select the [i]Perpendicular [/i]tool.[br]Click on the vertex A and the segment [BC].[/td][/tr][tr][td]stap 3[/td][td][/td][td]Select the [i]Perpendicular [/i]tool.[br]Click on the vertex B and the segment [AC].[/td][/tr][tr][td]stap 4[/td][td][/td][td]Select the [i]Perpendicular [/i]tool.[br]Click on the vertex C and the segment [AB].[/td][/tr][/table]What do you see?

You can make the construction by yourself the steps are shown by clicking on the navigation bar.[br]This is an option for students at home to provide them a construction that's correct to overview the steps again at home.