The additional piece of information to show that ∆RST∼QSU uses the SAS similarity theorem is <SRT≅<SQU.
The fundamental theorem of similarity states that a line segment divides two sides of a triangle into proportional segments if and only if the segment is parallel to the triangle's third side.
In this case, the additional piece of information to show that ∆RST∼QSU uses the SAS similarity theorem is <SRT≅<SQU.
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