How come not all rectangles are squares?

Answer 1

The characteristics for a rectangle is that it has to have 4 right angles and 2 pairs of congruent and parallel sides.

Squares have to meet these requirements and also have to have all sides congruent.

All rectangles meet to the rectangle's standard, but not all of them meet up to a square's standard. Therefore, not all rectangles are squares.

Or, in a more simplified version: squares are a type of rectangle, but rectangles are not a type of squares, therefore not all rectangles are squares.