Question

Choose the correct word and fill in the blanks :

___________ angles have a common vertex, and a common arm but no common interior points. (Vertical / Adjacent)

Answer 1

Adjacent angles :

Two angles are said to be adjacent angles, if they have a common vertex, a common arm (or side) and their non-common arms are on either side of the common arm.

As shown in the given figure, $\angle 1$ and $\angle 2$ are the adjacent angle.

Hence adjacent angles have a common vertex, and a common arm but no common interior points.