An equilateral triangle
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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.