In a quadrilateral ABCD, the bisectors of \[\angle \mathbf{A}\] and \[\angle B\] meet at O. If \[\angle C={{80}^{{}^\circ }}\]and \[\angle \mathbf{D}=\mathbf{12}{{\mathbf{0}}^{{}^\circ }}\], then measure of \[\angle \mathbf{AOB}\] is

In a quadrilateral ABCD, the bisectors of \[\angle \mathbf{A}\] and \[

1.	In a quadrilateral ABCD, the bisectors of \[\angle \mathbf{A}\] and \[\angle B\] meet at O. If \[\angle C={{80}^{{}^\circ }}\]and \[\angle \mathbf{D}=\mathbf{12}{{\mathbf{0}}^{{}^\circ }}\], then measure of \[\angle \mathbf{AOB}\] is
A.	\[{{40}^{{}^\circ }}\]
B.	\[{{60}^{{}^\circ }}\]
C.	\[{{80}^{{}^\circ }}\]
D.	\[{{100}^{{}^\circ }}\]
Answer» E.

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In a quadrilateral ABCD, the bisectors of \[\angle \mathbf{A}\] and \[\angle B\] meet at O. If \[\angle C={{80}^{{}^\circ }}\]and \[\angle \mathbf{D}=\mathbf{12}{{\mathbf{0}}^{{}^\circ }}\], then measure of \[\angle \mathbf{AOB}\] is

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