Any parallelogram that is not a rectangle or a square must have two obtuse angles (and two acute ones).
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parallelogram with one diagonal
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.
-- No right triangle, acute triangle, or equilateral triangle has an obtuse angle in it. -- If a triangle has an obtuse angle in it, then it's called an obtuse triangle. -- No triangle can have more than one obtuse angle in it .
square
No. A triangle can have only one obtuse angle. A triangle must have at least two acute angles