1) Create angle BAC with rays AB and AC[icon]/images/ggb/toolbar/mode_ray.png[/icon][br]2) Create a compass [icon]/images/ggb/toolbar/mode_compasses.png[/icon] with a radius of AB that intersects both rays of angle BAC[br]3) Add point D at the intersection [icon]/images/ggb/toolbar/mode_intersect.png[/icon] of the compass and ray AC[br]4) Create 2 compasses [icon]https://www.geogebra.org/images/ggb/toolbar/mode_compasses.png[/icon] with a radius of AB and place the centers at points B and D[br]5) Create ray AE [icon]/images/ggb/toolbar/mode_ray.png[/icon] and add point E at the intersection [icon]/images/ggb/toolbar/mode_intersect.png[/icon] of the 2 compasses[br]6) Show that angles DAE and BAE [icon]/images/ggb/toolbar/mode_angle.png[/icon]are congruent