The theorem is so called "angle-angle-side", which means if two corresponding angles are the same and the two sides are the same (tv=tv), then the two triangles are the same.
If you have not learned "angle-angle-side", then, you can use angle-side-angle, since two angles are the same, the 3rd angles should be the same (180-angle1-angle3=180-angle2-angle4)
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