A) \[40{}^\circ ,\,\,20{}^\circ \]
B) \[25{}^\circ ,\,\,35{}^\circ \]
C) \[30{}^\circ ,\,\,30{}^\circ \]
D) \[45{}^\circ ,\,\,15{}^\circ \]
Correct Answer: C
Solution :
\[AB=AC\] (Given) \[\angle A=\angle C\] \[\angle A+\angle B+\angle C=180{}^\circ \] \[\angle A+\angle A+120{}^\circ =180{}^\circ \] \[2\angle A=180{}^\circ -120{}^\circ =60{}^\circ \] \[\angle A=\frac{60{}^\circ }{2}=30{}^\circ \] \[\angle A=\angle C=30{}^\circ \]
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