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flystud777
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PostPosted: Sun Sep 07, 2008 11:59 am    Post subject: Geometry DS Questions Reply with quote
i can't bridge why together we cannot say that one of the angles in not 60?

any help would be appreciated.
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Ian Stewart
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PostPosted: Sun Sep 07, 2008 1:44 pm    Post subject: Reply with quote
Even with both statements, there are two possibilities:

-the angles are 90, 90, 45 and 135
-the angles are 90, 90, 60 and 120

In each case, we have two right angles, we have one angle which is double another, and the angles sum to 360. Hence E.
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