Intersecting lines

1. Choose the option Geometry Create Intersection Line-line.
2. Select the upper circle resulting from the 36-degree rotation executed in section 2.5.
3. Select the line resulting from the 33-degree rotation executed in section 2.6. (See Figure 10.)
4. Click Yes to confirm carrying out the intersection. The intersection has created a point. (Figure 11)
5. Press ESC to conclude the intersection of lines.
6. Create a line between point (55, 0) and the point generated by the intersection. To select the points, use the option Join C-a in the tool Line.
7. Choose the option Geometry Create Intersection Line-line to make another intersection between the lower circle and the line segment between point (40, 0) and point (55, 0). (See Figure 12.)
8. Again, go to the option Geometry Create Intersection Line-line to make an intersection between the upper circle and the farthest segment of the line that was rotated 36 degrees. (See Figure 13.)

NOTE: The order of selection in the intersecting process is important since the second line selected can not have higher entities.