No.
Irregular
No because an equilateral triangle is a regular polygon whereas an obtuse triangle is irregular
No - not a plane triangle. The angles of a regular triangle must be equal. So an obtuse triangle, if regular, would have three obtuse angles. The sum of the angles would then be greater than 3*90 = 270 degrees. But the sum of angles of a triangle must be 180 degrees.
obtuse triangle
No.
Irregular
No.
No because an equilateral triangle is a regular polygon whereas an obtuse triangle is irregular
No - not a plane triangle. The angles of a regular triangle must be equal. So an obtuse triangle, if regular, would have three obtuse angles. The sum of the angles would then be greater than 3*90 = 270 degrees. But the sum of angles of a triangle must be 180 degrees.
It is irregular
An obtuse triangle has 3 sides.
obtuse triangle
An obtuse triangle has an obtuse angle.
An oxymoron. An equilateral triangle cannot be obtuse; an obtuse triangle cannot be equilateral.
obtuse triangle
A triangle with 1 obtuse angle is called an obtuse triangle.