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law of congruency
The 3 vertices of a triangle when cut off will tessellate to form a straight line and angles on a straight line add up to 180 degrees or simply use a protractor to measure each angle.
Knowing that three angles are congruent only proves that two triangles are similar. Consider, for example, two equilateral triangles, one with sides of length 5 and the other of lengths ten. Both have three angles of 60 degrees each, but they are not congruent because their sides are not of the same length.
You have to choose one that fits the available data. Check the relationship between the data you know, for example an angle between two sides, etc.
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