2. RS=RS
Reason : Reflexive property of equality.
Step-by-step explanation:
Given RT=RU
TS=US
To prove that ![\triangle RST \cong \triangle RSU](/tpl/images/0389/6981/a4448.png)
Proof:
1. Statement: RT=RU; TS= US
Reason: Given in question
2.Statement: RS=RS
Reason: Reflexive property of equality.
Reflexive property: It is that property of equality which define a relation with itself.
3. Statement: ![\triangle AMD \cong \triangle BMC](/tpl/images/0389/6981/d0c8a.png)
Reason: SSS ( Side -SIde -Side congruence property of triangles)
Hence proved.
The correct answer is reflexive property of equality .