Q.
A circle with centre $O$ is inscribed in a quadrilateral $A B C D$ as shown in the figure. Which of the following statements is/are true?
(A) $\angle A O D+\angle B O C=180^{\circ}$
(B) $\angle A O B$ and $\angle C O D$ are complementary.
(C) $O A, O B, O C$ and $O D$ are the angle bisectors of $\angle A, \angle B, \angle C$, and $\angle D$, respectively.
Geometry
Solution: