Respuesta :

Adjacent angles are those which are neighboring each other and share a vertex and a side. 

Angles 2 and 4 are the only ones who share a vertex and a side (both of them are important), so that is the correct answer. 

Hope this helps :)
Adjacent angles would mean that the angles are next to each other, which means they have the same vertex, and share ONE side. 

Angles 2 and 4 are adjacent.
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