It is irregular
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A scalene triangle is irregular. Only an equilateral triangle is regular.
obtuse triangle
An obtuse triangle has an obtuse angle.
An oxymoron. An equilateral triangle cannot be obtuse; an obtuse triangle cannot be equilateral.
There are five different types of triangles named after their angles. Right triangle, Acute triangle, Isosceles Triangle ,equilateral triangle, and obtuse triangle. The Obtuse Triangle is the triangle with an obtuse angle.