## Class 9 Maths All Important Theorems

Class 9 Maths All Important Theorems Class 9 Chapter 8 Quadrilaterals Important Theorems Theorem 8.1 A Diagonals of a parallelogram divides it into two congruent triangles. Theorem 8.2 In a parallelogram, opposite sides are equal. Theorem 8.3 If each pair of opposite sides of a quadrilateral is equal, then it is a parallelogram. Theorem 8.4 …