A) \[90{}^\circ \]
B) \[180{}^\circ \]
C) \[45{}^\circ \]
D) \[110{}^\circ \]
Correct Answer: A
Solution :
(a): Let \[\angle a\And \angle b\] be supplementary \[\Rightarrow \angle a+\angle b=180{}^\circ \] But according to question, \[\angle a=\angle b\] \[\therefore \,\,\,\,2\angle a=180{}^\circ \] \[\therefore \,\,\angle a=90{}^\circ \]
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