-- Just go ahead and draw a triangle. Any triangle.
-- Did you do it ? Good.
-- Your triangle has three angles in it.
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Draw a triangle with one obtuse angle (more than 90 degrees), where none of the side lengths or angles are equal to each other.
You can't. All the angles in a triangle will add up to 180 degrees, therefore a triangle with one angle greater than this is impossible.
An obtuse angled triangle, or more simply, an obtuse triangle.
-- 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 .
Obtuse triangle