Answer:
SAS
Step-by-step explanation:
Given is an isosceles trapezium with top base as ST and Bottomg base as UV
The non parallel sides SU and TV are equal
Since in an isosceles trapezium the non parallel angles are equal, we have
angle SUV = angle TVU
Consider the two triangles SUV and TUV
UV = UV Reflection property
SU = TV Isosceles trapezium
Angle SUV = TVU -do-
By SAS the two triangles are congruent
So answer is SAS