Write a two column proof for the following

Question

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

Answer 1

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