Answer: a) Yes, triangles PQR and STU are congruent.
b) SAS congruence criteria
c) The perimeter of ∆PQR is 17 ft.
Explanation:
In the given picture, we can see in triangles PQR and STU
Segment PQ= Segment ST=4 ft
Segment QR= Segment TU=6 ft
∠ PQR=∠STU
Therefore, by SAS congruence criteria ,
Δ PQR ≅ ΔSTU
⇒ PR= SU [corresponding sides of congruent triangles are congruent]

The perimeter of ∆PQR is given by :-
