On the [i]GeoGebra [/i]page is a photo of a house designed by Frank Lloyd Wright, a very famous architect. [br][br]Find two different sets of perpendicular lines within the photo.  Use the MOVE tool [icon]/images/ggb/toolbar/mode_move.png[/icon]to move and re-size the [b][color=#ff0000]red [/color][/b]line segments to identify the perpendicular lines you found.[br][br]Find two different pairs of parallel lines.  Use the [b][color=#9900ff]purple [/color][/b]lines to identify these parallel lines.[br][br]Use the [b][color=#0000ff]blue [/color][/b]lines to identify an acute angle in the picture.[br][br]Use the [b][color=#38761d]green [/color][/b]lines to identify an obtuse angle in the picture.Use the black lines to identify a right angle in the picture.