Answer:
b.Symmetric property of congruence.
Explanation:
We are given that
ST=QR
QR=ST
We have to find the name of the property of equality or congruence that justifies going from the firs statement to the second statement.
When AB=CD
CD=AB
It is called symmetric property of congruence.
Therefore, given property is symmetric property of equality that justifies going form the first statement to the second statement.
Answer:b.Symmetric property of congruence.