if you want a short answer, an angle with a measure between 180 degrees and 90 degrees
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yes that would be an obtuse angle!
obtuse + acute = obtuse or straight or reflex.
No. A triangle equals 180o. An obtuse angle is anything above 90o. If you were to have two obtuse triangles, then one word for it, if you have one more angle, would be a square or parallelogram.
An obtuse angle is an angle between (but not including) 90 and 180 degrees, so some obtuse angles would be 91 degrees, 179 degrees, and 142 degrees.
No That would be an equilateral triangle