Draw and mark a figure in which m is the midpoint of st, sp = pt, and t is the midpoint of pq.

It is given that ,M is mid point of ST.

 So,SM=MT------(1)

Also, it is given that

 SP=PT -------(2)

From (1) and (2)

Point M =Point T

And, T is mid point of PQ.

→  PT=QT-----(3)

From 2 and 3, we get

SP=PT=QT

Second Way

There is another geometrical shape possible .

The Image is attached below.

2 is the final ! : )