A circle with centre O is inscribed in a quadrilat-
eral ABCD as shown in the figure. Which of the
following statements is/are true?
(A)angleAOD +angle BOC= 1809
(B)angle AOB and angleCOD are complementary:
(C) 0A, OB. OC and OD are the angle bisectors
of angleA ,angleB,angleC and angle D respectively
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In the given figure, all the sides of the quadrilateral ABCD touch a circle with centre O. Prove that ∠AOB + ∠COD = 180° and ∠BOC + ∠AOD = 180
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