[b]Task[/b]: Construct a parallelogram by following the construction steps provided below. [table][tr id=kstep_1][td][size=100]1.[/size][/td][td][size=100][icon]/images/ggb/toolbar/mode_join.png[/icon][/size][/td][td][size=100]Select the [i]Line [/i]tool and create an arbitrary line [i]AB[/i] by clicking twice in the [i]Graphics View[/i].[/size][/td][/tr][tr id=kstep_2][td][size=100]2.[/size][/td][td][size=100][icon]https://tube.geogebra.org/images/ggb/toolbar/mode_join.png[/icon][/size][/td][td][size=100]Create a line [i]BC[/i]. [u]Hint[/u]: Select point [i]B[/i] and then click in the [i]Graphics View[/i] in order to create point [i]C[/i].[/size][/td][/tr][tr id=kstep_3][td][size=100]3.[/size][/td][td][size=100][icon]/images/ggb/toolbar/mode_parallel.png[/icon][/size][/td][td][size=100]Activate the [i]Parallel Line[/i] tool and create a parallel line to line [i]AB[/i] through point [i]C[/i]. [u]Hint[/u]: Select the line [i]AB[/i] and then point [i]C[/i].[/size][/td][/tr][tr id=kstep_4][td][size=100]4.[/size][/td][td][size=100][icon]https://tube.geogebra.org/images/ggb/toolbar/mode_parallel.png[/icon][/size][/td][td][size=100]Create a parallel line to line [i]BC[/i] through point [i]A[/i].[/size][/td][/tr][tr id=kstep_5][td][size=100]5.[/size][/td][td][size=100][icon]/images/ggb/toolbar/mode_intersect.png[/icon][/size][/td][td][size=100]Select the [i]Intersect [/i]tool and create the intersection point [i]D[/i] of the two lines. [u]Hint[/u]: Click directly on the intersection point.[/size][/td][/tr][tr id=kstep_6][td][size=100]6.[/size][/td][td][size=100][icon]/images/ggb/toolbar/mode_polygon.png[/icon][/size][/td][td][size=100]Activate the [i]Polygon[/i] tool and create the parallelogram [i]ABCD[/i] by successively selecting all the vertices. [u]Note[/u]: In order to close your polygon, select the first point again.[/size][/td][/tr][tr id=kstep_7][td][size=100]7.[/size][/td][td][size=100][icon]/images/ggb/toolbar/mode_move.png[/icon][/size][/td][td][size=100]Select the [i]Move[/i] tool and drag the vertices of the parallelogram to check if it was constructed correctly.[/size][/td][/tr][tr id=minusAndPoints][td][/td][td][/td][td][/td][/tr][/table]
[b]Intermediate steps checking tools[/b]: [list] [*] kstep_1: Checks for a line [*] kstep_2: Checks for two lines [*] kstep_3: Checks for a parallel line [*] kstep_4: Checks for another parallel line [*] kstep_5: Checks for the intersection point of two parallel lines [/list] [b]Final result checking tool:[/b] [list][*] kstep_6: Checks for a parallelogram[/list] [b]Special cases checking tools:[/b] [list] [*] kstep_7: Checks for a square [*] kstep_8: Checks for a rhombus [*] kstep_9: Checks for a rectangle [/list] --> all checking tools work for the given instruction steps