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Q: Is a obtuse triangle regular or not regular?

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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.

No because an obtuse angle is greater than 90 degrees and a regular triangle is an equilateral triangle that has 3 equal 60 degree angles that add up to 180 degrees.

obtuse triangle

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No.

No.

No because an equilateral triangle is a regular polygon whereas an obtuse triangle is irregular

It 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.

No because an obtuse angle is greater than 90 degrees and a regular triangle is an equilateral triangle that has 3 equal 60 degree angles that add up to 180 degrees.

An obtuse triangle has 3 sides.

obtuse triangle

An obtuse triangle has an obtuse angle.

obtuse triangle

An oxymoron. An equilateral triangle cannot be obtuse; an obtuse triangle cannot be equilateral.

A triangle with 1 obtuse angle is called an obtuse triangle.

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