Adjacent Angles
Two angles are Adjacent when they have a common side and a common vertex (corner point), and don't overlap.
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Angle ABC is adjacent to angle CBD Because:
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What Is and Isn't an Adjacent Angle
Adjacent Angles
they share a vertex and a side
NOT Adjacent Angles
they only share a vertex, not a side
NOT Adjacent Angles
they only share a side,
not a vertex
Don't Overlap!
ALSO the angles must not overlap.
NOT Adjacent Angles
angles a and b overlap
2104, 2105