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No - not a plane triangle.

The angles of a regular triangle must be equal.

So an obtuse triangle, if regular, would have three obtuse angles. The sum of the angles would then be greater than 3*90 = 270 degrees. But the sum of angles of a triangle must be 180 degrees.

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โˆ™ 2012-12-16 20:35:52
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Q: Can an obtuse triangle be regular why?
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