When two lines meet at a common point or vertex, the angle between them is called the included angle. The named lines define the angle. So for example, the angle
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Angle abc.
Angle MPN
If two sides and the included angle of one of one of the triangle are congruent to two sides and the included angle of another triangle, then the triangles are congruent.
angle P
The Angle Side Angle postulate( ASA) states that if two angles and the included angle of one triangle are congruent to two angles and the included side of another triangle, then these two triangles are congruent.