A triangle
Any polygon can have at least one right angled - for example a right angled triangle. An example of an irregular polygon with only right angles is a rectangle.
No, but an equilateral triangle is a regular polygon with 3 equal sides and 3 equal angles.
A right triangle.
No. A regular polygon has all sides equal and all angles equal. Neither of those properties can be true of a right triangle. A regular triangle is an 'equilateral one'. Its sides are equal, and each of its angles is 60 degrees.
A triangle
Any polygon can have at least one right angled - for example a right angled triangle. An example of an irregular polygon with only right angles is a rectangle.
A right angle triangle
No, but an equilateral triangle is a regular polygon with 3 equal sides and 3 equal angles.
A right angle triangle or an obtuse triangle
It is a right angle triangle
An equalateral triangle
A triangle with 1 right angle and 2 congruent acute angles is both a right triangle and an isosceles triangle.
An equilateral triangle.
A right triangle.
No. A regular polygon has all sides equal and all angles equal. Neither of those properties can be true of a right triangle. A regular triangle is an 'equilateral one'. Its sides are equal, and each of its angles is 60 degrees.
A three sided polygon (aka triangle) with one of it's angles being 90 degrees.