Homeclass9RD-Sharma R.D. Sharma Solutions Class 9th: Ch 10 Congruent Triangles Exercise 10.4 Ashu 12 Jul, 2018 Chapter 10 Congruent Triangles R.D. Sharma Solutions for Class 9th Exercise 10.4 Exercise 10.4 1.Â In Fig. 10.92, it is given that AB = CD and AD = BC. Prove that Î”ADC â‰…Î”CBA. Â Solution 2. In a Î”PQR, 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