Answer:
Side Side Angle (SSA) congruence.
Explanation:
1) Retrieving the missing data:
[tex]Is \bigtriangleup RST \:=\bigtriangleup XYZ?[/tex]
[tex]\overline{RS}\cong \overline{XY}\\\overline{ST}\cong \overline{YZ}\\\angle S \cong \angle Y[/tex]
Check the triangles below:
2) Side Angle Side congruence tells us that a pair of triangles are congruent if and only if their respective side, angle and side are congruent. Since RS ≅ XY and ST≅YZ and in addition to this, ∠S≅∠Y then the it's SSA postulate.
So, it's SSA.
