An obtuse triangle is not necessarily isosceles, but it can be.
Not every triangle has to have an obtuse angle.
because if it is obtuse, there is no right angle. each corner has to be over 90 degrees (a right angle) to be an obtuse triangle.
It is an obtuse or scalene triangle having the given angles
None normally but if it is in the shape of an isosceles triangle then it will have 2 equal sides.
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.
An obtuse triangle has an obtuse angle.
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.
Sometimes, it can or can not be a obtuse triangle.