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Write a two column proof for the following

If PQ is congruent to QS and QS is congruent to ST, then PQ equals ST.

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Muhammad C. | Muhammad the grand math tutorMuhammad the grand math tutor
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Statement         |          Reason

1) PQ is con-         1) given

gruent to QS

2) QS is con-         2) given

gruent to ST

3) PQ is con-         3) Chain Rule 

gruent to ST

Comments

I would say another term used for "Chain Rule" would be "Transitive Property of Congruence".
They are essentially the same except one is used more for logic proofs instead of geometry proofs.