{ 1 } - Both are based on sense experience.
{ 2 } - Both are based on pure thinking and not on sense experience.
{ 3 } - Both are filled with controversies.
{ 4 } - Both were required subjects for graduation.

In geometry, we use our minds to grasp pure ideas, like the idea of a perfect circle, which is the model of the imperfect circles of the material world. So too in ethics, we use our minds to grasp the idea of the Good, which is an objective pattern of perfection that provides the basis for ethics.