A) \[\text{20 }\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[\text{30 }\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[\text{40 }\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[\text{60 }\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: C
Solution :
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