yes
A right triangle.
An acute triangle.
Any polygon can contain acute interior angles.
An acute polygon is one whose interior angles are all acute. Only a triangle can be an acute polygon.
A right angle triangle
yes
A right triangle.
An acute triangle.
The only polygon with just acute angles is an acute angled triangle.
Any polygon can contain acute interior angles.
An acute polygon is one whose interior angles are all acute. Only a triangle can be an acute polygon.
A right angle triangle or an obtuse triangle
a right triangle
Although a triangle must have at least two acute interior angles, a square has four interior right angles and no acute angles. And as regular polygons have increasing numbers of sides, their interior angles get larger.
If its acute angles are different then it is not a regular polygon but if it has 3 equal acute angles of 60 degrees then it is a regular equilateral triangle
Parallelogram.