Answer:
Adjacent angles
Step-by-step explanation:
we know that
Adjacent angles are two angles that have a common side and a common vertex (corner point), and don't overlap
In this problem
The common side is the segment DB and the common vertex is vertex B
therefore
the answer is
∠9 and ∠10 are adjacent angles
Note
The problem does not specify that the figure ABCD is a rectangle, but if it were, the angles would also be complementary
