The most notable is a triangle, but every polygon can have an obtuse angle. An obtuse angle is anything measuring greater than 90 degrees.
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No right triangle can have any obtuse angles inside it.
No, but it contains 2 obtuse angles and 2 acute angles
Just the one.
Yes because a parallelogram normally has 2 equal opposite obtuse angles and 2 equal opposite acute angles in which all 4 angles add up to 360 degees.
Well the list will go on forever but an obtuse angle is an angle bigger than 90 degrees!