1) Use the Circle with Center through Point tool[icon]/images/ggb/toolbar/mode_circlepointradius.png[/icon] to draw a circle with center at point B.[br]2) Use the Intersect tool[icon]/images/ggb/toolbar/mode_intersect.png[/icon] to mark where that circle intersects the two sides of angle B.[br]3) Use the Compass tool[icon]/images/ggb/toolbar/mode_compasses.png[/icon] to create two congruent circles centered on the two intersection points you just created. Do this by clicking one intersection point, then the other twice. Then reverse the points to create the second circle.[br]4) Use the Intersect tool[icon]/images/ggb/toolbar/mode_intersect.png[/icon] to mark where those two circles intersect.[br]5) Use the Ray tool[icon]/images/ggb/toolbar/mode_ray.png[/icon] to make a ray from point B through the intersection of the circles.[br]6) Use the Angle Measure tool[icon]/images/ggb/toolbar/mode_angle.png[/icon] to verify that the two smaller angles are half of the original.