All quadrilaterals have 4 sides hence the root word quad. If you have 4 equal sides with 4 equal angles you have your basic square.
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NO!!! It can be a Rhombus. Square ' 4 equal sides and four angles at 90 degrees. Rhombus' 4 equal sides, but no angles at 90 degrees.
4 sides and 4 interior angles
Various shapes do. The most obvious is a square, if you are looking for the 4 sides to be equal and the 4 angles to be equal. You can also have a rectangle or a parallelogram or a diamond shape and any arrangement of 4 sides for a shape.More generally ,it is known as a quadrilateral (a polygon with four sides and four angles).
If all 4 sides are equal and the angles are not 90 degrees it is a rhombus.
No, not necessarily. A parallelogram can have all sides equal, but still not be a square.