It has 3 sides and 3 interior angles that add to 180 degrees
Its interior angles are an obtuse angle and 2 different acute angles
Its 3 exterior angles add up to 360 degrees
It has no diagonals
It has no lines of symmetry
It can tessellate
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true
It means it has one angle over 90 degrees.
obtuse triangle
A triangle with 1 obtuse angle is called 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 .