I didn’t say rectangles are squares, I said rectangles are square.
Square can be an adjective. When you say a rectangle is square, you’re saying all four corners are square. If you make a picture frame in the shape of a oblique parallelogram, it’s not square. If you make it in the shape of a rectangle, it’s square. If you make it in the shape of a square, it is both square and a square.
Square means “90 degrees”, so rectangles are square. They’re just not “a” square.
Square has multiple meanings actually.
Your comment makes you sound square, for example.
We square?
We should keep talking about it to square it away
It’s the other way. All squares are rectangles, but not all rectangles are squares.
Rect-angle, rectus-angle, right/proper-angle
I didn’t say rectangles are squares, I said rectangles are square.
Square can be an adjective. When you say a rectangle is square, you’re saying all four corners are square. If you make a picture frame in the shape of a oblique parallelogram, it’s not square. If you make it in the shape of a rectangle, it’s square. If you make it in the shape of a square, it is both square and a square.
That’s a weird and confusing language if true.
At least in geometry square is a special case of rectangle.
Edit: I looked into dictionary and you are right, it also is another word for right angle. English is a weird language.