An equilateral triangle
Any shape with 4 acute angles must have more than 4 sides. Any shape with more than 4 sides can have 4 acute angles (but doesn't have to).
A rhombus is a shape having two acute angles and four equal sides.
Sides aren't acute, angles are. A triangle with three acute angles would be called (appropriately enough) an acute triangle.
The word acute refers to angles, not sides. It does have all three angles are acute (less than 90°)
Any triangle that has three equals sides must have three acute angles and is equilateral.
Any shape with 4 acute angles must have more than 4 sides. Any shape with more than 4 sides can have 4 acute angles (but doesn't have to).
A rhombus is a shape having two acute angles and four equal sides.
Sides aren't acute, angles are. A triangle with three acute angles would be called (appropriately enough) an acute triangle.
The word acute refers to angles, not sides. It does have all three angles are acute (less than 90°)
Any triangle that has three equals sides must have three acute angles and is equilateral.
a trapaziod
It could be a hexagon which is stretched out so that one pair of opposite angles become acute - but they must be different otherwise you will have three pairs of parallel sides.
equiangular equilateral
hexagon
A shape that has three sides and includes right angles is a right triangle. In a right triangle, one of the angles is exactly 90 degrees, and the other two angles are acute. The sides of the triangle consist of the two legs that form the right angle and the hypotenuse opposite the right angle.
parallelogram
It could be a hexagon which is stretched out so that one pair of opposite angles become acute - but they must be different otherwise you will have three pairs of parallel sides.