GMAT一道数学题(data sufficiency)求解Is the measure of one of the interior of quadrilateral ABCD eaqual to 60 degrees?(1)Two of the interior angels are right angels.(2)The degree measure of angel ABC is twice the degree measure of angel BCD.为
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GMAT一道数学题(data sufficiency)求解
Is the measure of one of the interior of quadrilateral ABCD eaqual to 60 degrees?
(1)Two of the interior angels are right angels.
(2)The degree measure of angel ABC is twice the degree measure of angel BCD.
为什么不选B呢,难道条件(2)不能单独推论出该平行四边形有一个角必为60°吗:两个内角和应为180°,角ABC=2角BCD,那不就是得出角ABC为120°,而角BCD为60°吗?
quadrilateral是四边形的意思,不是平行四边形,因此没有两内角和为180的默认条件.
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