Andhra Pradesh Board Solutions for Chapter: Quadrilaterals, Exercise 3: EXERCISE - 8.2

In the adjacent figure, $ABCD$ is a parallelogram $ABEF$ is a rectangle, show that $∆AFD\cong ∆BEC$.

 Show that the diagonals of a rhombus divide it into four congruent triangles.

In a quadrilateral $ABCD$, the bisector of $\angle C$ and $\angle D$ intersect at $O$.

Prove that $\angle COD=\frac{1}{2}\left(\angle A+\angle B\right)$