Is a rectangle a square Yes or no?

Conclusion: a square is always a rectangle, but a rectangle is not always a square. However, it is important to keep in mind that even though all squares are rectangles, not all rectangles are squares.

Why is a rectangle not square?

A quadrilateral is a rectangle if all four internal angles are 90∘ . A quadrilateral is a square if all four internal angles are 90∘ and all four sides are equal in measure. The above is a rectangle, as all four angles are 90∘ , but is not a square, as the two vertical sides are shorter than the two horizontal sides.