Theorem 8.1 Class 9 || A diagonal of a triangle divide a parallelogram in two congruent triangles. Theorem 8.1 class 9 • Theorem 8.1 Class 9 || A diagonal of a tri... Theorem 8.2 class 9 • Theorem 8.2 Class 9 || opposite sides of a... Theorem 8.3 class 9 • Theorem 8.3 class 9 see description below Theorem 8.4 class 9 • Theorem 8.4 Class 9 Chapter 8 Opposite ang... Theorem 8.5 class 9 • Theorem 8.5 class 9 If the opposite angles... Theorem 8.6 class 9 • Theorem 8.6 class 9 The diagonals of a par... Theorem 8.7 class 9 • Theorem 8.7 class 9 if the diagonals of a ... Theorem 8.8 class 9 • Theorem 8.8 C9 A Quadrilateral is a parall... Theorem 8.9 class 9 Theorem 8.10 class 9 • Theorem 8.10 Class 9 Converse of Mid point...