Let's check I the given pairs of triangles are congruent or not ~
problem 1
These triangles are congruent by SSS congruency, as it's three sides are equal.
・ .━━━━━━━†━━━━━━━━━.・
problem 2
・ .━━━━━━━†━━━━━━━━━.・
These triangles are not congruent because they don't fulfill any congruency criteria.
problem 3
These triangles are congruent by AAS congruency criteria, since two angles and one of the side is common.
・ .━━━━━━━†━━━━━━━━━.・
problem 4
These triangles are not congruent because they don't fulfill any criteria.
・ .━━━━━━━†━━━━━━━━━.・
problem 5
These triangles are congruent by SSS congruency, as it's two sides are equal and one side is common.
・ .━━━━━━━†━━━━━━━━━.・
problem 6
These triangles are congruent by SAS congruency, since two sides and Angle between them are equal.
・ .━━━━━━━†━━━━━━━━━.・
Problem 7
These given triangles are congruent by SSS congruency, because they have two equal sides and one common side in there.
・ .━━━━━━━†━━━━━━━━━.・
problem 8
These triangles are congruent by ASA congruency, because they have one pair equal angles, one pair of vertical opposite angles (they are equal) and a side between them equal.
・ .━━━━━━━†━━━━━━━━━.・
problem 9
These given triangles are congruent by SSS congruency, because they have two equal sides and one common side in there.
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