GRE

简答题 For this question，indicate all of the answer choices that apply． Which of the following must be true?

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B．The upper left corner of the triangle in the figure measures 72°，because vertical angles have the same measure．The upper right corner of the triangle is supplementary to one measurin9 153。．thus measures l80°-153°=27°． The bottom angle of the triangle thus measures l80°-72°-27°=81°．As theangle marked χ is supplementary to this．it measures χ=180°-81°=99°．

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