Angles Formed By Intersecting Lines

Below is a picture of intersecting rail road tracks. Use the image to answer the questions below:
Select the points in order and the angle measure tool to measure the following angles: CGF, FGD, DGE, EGC. What do you notice about the measures of angles CGF and DGE? Are there any other angles that have the same relationship? What do you notice about the measures of angles CGF and FGD? Are there any other angles that have that same relationship? Find a similar image of lines that intersect, upload the image into GeoGebra. Create two lines on top of image uploaded and point of intersection. Then measure the angles and see if your observations hold.