Question 51165
Using a compass you place the point of the compass on the vertex
and sketch small arcs on each side of the angle you wish to bisect.
You then place the point of the compass on successively oneach of the 
arcs and draw intersecting arcs in the interior of the angle thus
establishing a point of intersection of the two arcs.
You then draw a line through that point of intersection and the vertex
of the angle.  The line will bisect the angle into two equal angles.

Cheers,
Stan H.