$ 0 0 Chapter 10 Congruent Triangles R.D. Sharma Solutions for Class 9th Exercise 10.4Exercise 10.41. In Fig. 10.92, it is given that AB = CD and AD = BC. Prove that ΔADC ≅ΔCBA. Solution2. In a ΔPQR, if PQ = QR and L, M and N are the mid-points of the sides PQ, QR and RP respectively. Prove that LN = MN.Solution