Question

Given:
RT = RU
TS = US
Prove:
△RST ≅ △RSU

Statement
Reason
1. RT = RU; TS = US
1. Given
2. RS = RS
?
3. △AMD ≅ △BMC
3. SSS

Answer 1

any image about this ?

Answer 2

Something is congruent to itself by the reflexive property of congruence.
The rest of this proof doesn't even matter. We are just wondering why RS is congruent to itself.
If that really is an equal sign, then you just need to change the word congruence to equality.

Answer 3

so what are these there : 3. △AMD ≅ △BMC
3. SSS

???

may be one second problem ?