Question

ps\sq=pt\tr and also anglepst=angleprq prove that trriangle is an isosceles triangle

Answer 1

Now since ps\sq=pt\tr
Therefore st parallel qr
We have. angle PST =PTS
But angle PST is equal to angle pqr corresponding angles similarly
Angle pts=angle prq
Therefore angle pqr =prq
Therefore pq=pr. Side opp. to equal angles