Good job, angles c and d are adjacent and so are angles b and d. There are many pairs of adjacent angles in the picture. Now, let's talk about vertical angles . Angles a and d are vertical angles. Angles f and g are also vertical angles.
Vertical angles share only one point.
That point is called the vertex. Angles e and h are also vertical angles. Now that we know what adjacent and vertical angles are, let's talk about alternate interior angles . Angles c and f are alternate interior angles. Angles d and e are also alternate interior angles.