When is a square not a rectangle?

Answer 1

A square has 4 equal sides, and 4 equal angles and are considered paralellagrams

A rectangle has 4 equal angles but not necessarily 4 equal sides, it is also a parallelagram..

On a square all sides are congruent, while in a rectangle only opposite sides are.

So when is a square not a rectangle?

what defines a rectangle and a square, each shape has to have 4 right angles.

the sides are parallel and that in a square all four sides are congruent while in a rectangle only the opposite sides are congruent.

So a rectangle must have opposite sides that are parallel and equal and four right angles. A square must have opposite sides parallel, all sides congruent, and four right angles. a rectangle is a parallelogram with four right angles, while a square is a parallelogram with four congruent sides and four right angles.

By this definition a rectangle is a square since it has opposite sides that are congruent and parallel and it has four right angles.

The question is, why a rectangle is not a square?

A rectangle is not a square because it is not required to have four congruent sides.