1) Bisect TWO of the angles.[br]2) Use the Intersect tool[icon]/images/ggb/toolbar/mode_intersect.png[/icon] to create a point where the two angle bisectors intersect.[br]3) Using any of the sides, create a line perpendicular to that side that goes through the point you created in step 2.[br]4) Use the Intersect tool[icon]/images/ggb/toolbar/mode_intersect.png[/icon] to mark the point where that perpendicular line crosses the side you chose to use.[br]5) Use the Compass tool[icon]/images/ggb/toolbar/mode_compasses.png[/icon] to create a circle with a radius equal to the distance between between the two points you've marked, centered at the intersection of the angle bisectors.