A 4 pointed star.
There are 4 types of angles which are acute, right, obtuse and reflex
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).
An irregular dodecagon.
Acute angle, right angle, obtuse angle and reflex angle
It is a rhombus or a parallelogram