Question

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in the figure shown, ∠4 is an exterior angle.
why do you think the term \exterior\ is used to describe ∠4?
exterior means \outside,\ and ∠4 faces outside the triangle.
which interior angle is adjacent to ∠4?
∠1 ∠2 ∠3

Explanation:

Adjacent angles share a common side and vertex. In the triangle, ∠3 and ∠4 share a common side and vertex.

Answer:

∠3