Question

when two lines intersect, the angles opposite each other are

Explanation:

Vertical angles are formed when two lines intersect. They are opposite each other and have equal measures. In the given diagram, the two \(40^{\circ}\) angles are opposite each other, which is the key characteristic of vertical angles. Linear angles are adjacent and form a straight line (sum to \(180^{\circ}\)). Adjacent angles share a common side and vertex. Complementary angles sum to \(90^{\circ}\). Since the problem emphasizes "angles opposite each other", vertical angles is the correct term.

Answer:

Vertical angles