Pls name the postulate or theorem you can sue to prove qts=srq

The correct option is 4.

Step-by-step explanation:

According to the HL postulate of congruent triangles, two right angled triangle are congruent if hypotenuse and a corresponding leg are congruent.

From the given figure it is clear that triangle QRS and triangle QTS are two right angled triangles.

In triangle QRS and triangle QTS,

                       (Common side and hypotenuse)

                        (Given)

Since hypotenuse and one corresponding leg of both triangles are congruent, therefore by HL postulate of congruent triangles both triangles are congruent.

Therefore the correct option is 4.