It depends on which angles are 1 and 2.
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Such angles are called complementary angles.
Are complementary angles alwys adjacent?
Rectangles have congruent adjacent angles.
Two angles are adjacent if they have the same vertex, share a side and do not overlap. It is, therefore, perfectly possible for two obtuse angles to be adjacent. In fact, every pair of adjacent angles in a hexagonal tessellation (a honeycomb, for example), consists of a pair of obtuse angles (120 degrees).
Two adjacent angles are considered supplementary angles. They aggregate and make an angle that measures 180 degrees.