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 5-sided polygon, or pentagon, can have a varying number of acute angles, depending on its specific shape. However, the sum of the interior angles of a pentagon is 540 degrees. Since an acute angle is defined as an angle less than 90 degrees, a pentagon can have 0 to 4 acute angles, but typically, it may have 1 to 3 acute angles while still maintaining the overall angle sum.
A polygon, that is, a plane area bounded by any number (>2) of straight lines can have acute angles.
An acute triangle.
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
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.
That's an 'acute' triangle.
Parallelogram.
A triangle having all angles less than 90 degrees is a polygon having no parallel sides and all acute angles.
A square
A 5-sided polygon, or pentagon, can have a varying number of acute angles, depending on its specific shape. However, the sum of the interior angles of a pentagon is 540 degrees. Since an acute angle is defined as an angle less than 90 degrees, a pentagon can have 0 to 4 acute angles, but typically, it may have 1 to 3 acute angles while still maintaining the overall angle sum.
A polygon, that is, a plane area bounded by any number (>2) of straight lines can have acute angles.
A right angle triangle