In Fig. 6.16. PS/SQ = PT/TR and angle PST = angle PRQ. Prove that PQR is an isosceles triangle. In Fig. 6.16. PS/SQ = PT/TR and angle PST = angle PRQ. Prove that PQR is an isosceles triangle. October 5, 2020 Category: Chapter 6 - Triangles , Maths , NCERT Class 10 ,