Recognizing graphs of proportional relationships

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

Ineed in figuring out this problem.