COPYING AN ANGLE. Create a line to hold one side of the copy of the angle. Hide the two points used to create this line. Put a point on this line; this will be the vertex of the copied angle. Label this new vertex $\,A'\,$. You should now be looking at something like this: Pick an appropriate radius (say. Copying an Angle. In the space below angle BAC, draw ray RY. Using B as center, use the circle tool to draw an circle of any radius that intersects both ray BA and ray BC. Construct points D and E where the circle intersects those rays. Use the segment tool to construct any radius of the circle you just constructed in Step buddyicon.info: U/Emathguy. GeoGebra an be used to "simulate" a hand construction, by using only the circle and segment tools. Uncheck VIEW-AXES. Select OPTIONS-LABELING-NEW POINTS ONLY, so that only new points will be labeled. Create a segment to copy; name the endpoints A and B. Create a line to hold the copy of the segment. Hide the two points used to create this line.