Definitions for obtuse angle
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Random House Webster's College Dictionary
obtuse′ an′gle(n.)
an angle greater than 90° but less than 180°.
Category: Math
Origin of obtuse angle:
1560–70
ob•tuse′-an′gled(adj.)
Princeton's WordNet
obtuse angle(noun)
an angle between 90 and 180 degrees
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"obtuse angle." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/obtuse angle>.