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).
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A rhombus is a shape having two acute angles and four equal sides.
it is a rhombus
A four edged star.
No shape does. If a shape has four angles, the sum of the four angles is 360°. If two are right angles, their sum is 2 x 90° = 180°, leaving 360° - 180° = 180° for the two remaining angles. An acute angle is less than 90°, so the sum of two acute angles is less than 90° + 90° = 180°, but in this shape their sum must be equal to 180°; thus no shape can exist. If one angle is acute and the other is obtuse, then their sum can be 180° and the shape is a trapezium.
If the figure has only four sides all together, then it's not possible for all four angles to be acute.