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In quadrilateral ABCD, angle C=72^@ and ...

In quadrilateral ABCD, `angle C=72^@` and `angle D =28^@`. The bisectors of `angle A` and `angle B` meet in O. What is the measure of `angle AOB` ?
चतुर्भुज ABCD में, `angle C=72^@` और `angle D =28^@` है | कोण A तथा कोण B के समद्विभाजक O पर मिलते हैं | कोण AOB का मान ज्ञात करें |

A

`36^@`

B

`48^@`

C

`50^@`

D

`54^@`

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