Construct the Wallace-Simson line and animate your construction.[br][br]Explore the construction and learn how to create the Wallace-Simson line with [url=https://www.geogebra.org/geometry]GeoGebra Geometry[/url]. Then try it yourself by following the instructions below.

[b]Note:[/b] If you're using the Mobile App make sure that the chosen [i]Labeling[/i] option is [i]New Points Only[/i]. You can change this by going to the [i]Settings [/i]in the app's menu and then selecting [i]General.[/i][br][br][table][tr][td]1.[/td][td][icon]https://www.geogebra.org/images/ggb/toolbar/mode_join.png[/icon][/td][td]Construct a triangle using the [i]Line[/i] tool. The points [i]A[/i], [i]B[/i] and [i]C[/i] are intersection points of the lines. [/td][/tr][tr][td]2.[/td][td][icon]https://www.geogebra.org/images/ggb/toolbar/mode_circle3.png[/icon][/td][td]Select the [i]Circle through 3 Points[/i] tool and select the points [i]A[/i], [i]B[/i] and [i]C[/i].[/td][/tr][tr][td]3.[/td][td][icon]https://www.geogebra.org/images/ggb/toolbar/mode_point.png[/icon][/td][td]Create point [i]D[/i] on the outline of the circle.[/td][/tr][tr][td]4.[/td][td][icon]https://www.geogebra.org/images/ggb/toolbar/mode_orthogonal.png[/icon][/td][td]Activate the [i]Perpendicular Line[/i] tool. Create three perpendicular lines through point [i]D[/i]. The first line should be perpendicular to [i]AB[/i], second to [i]BC[/i] and third to [i]AC[/i].[/td][/tr][tr][td]5.[/td][td][icon]https://www.geogebra.org/images/ggb/toolbar/mode_intersect.png[/icon][/td][td]Select the [i]Intersect[/i] tool and create the points [i]E[/i], [i]F[/i] and [i]G[/i] by clicking on a line ([i]AB[/i], [i]BC[/i] and [i]AC[/i]) and it's corresponding perpendicular line.[/td][/tr][tr][td]6.[/td][td][icon]https://www.geogebra.org/images/ggb/toolbar/mode_join.png[/icon][/td][td]Create a line through point [i]E[/i] and [i]G[/i]. Change the style of this line. [br][/td][/tr][tr][td]7.[/td][td] [/td][td]Move point [i]D.[br][/i][b][/b][b]Note: [/b]When using the Online or Desktop App you can animate point [i]D [/i]by selecting it and[i] [/i]then choosing [i]Animation.[/i][/td][/tr][/table]