A) \[\text{180 }\!\!{}^\circ\!\!\text{ }\]
B) \[\text{90 }\!\!{}^\circ\!\!\text{ }\]
C) \[\text{60 }\!\!{}^\circ\!\!\text{ }\]
D) \[\text{360 }\!\!{}^\circ\!\!\text{ }\]
Correct Answer: B
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