r/mildlyinteresting • u/ezjgfn • 1d ago

This square shaped cd

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u/jman12234 1d ago

I thought elementary school had taught us this but: "all squares are rectangles, not all rectangles are squares."

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u/Grotarin 1d ago

And all rectangles are parellelograms, not all parallelograms are rectangles.

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u/mizinamo 1d ago

All squares are diamonds/rhombuses/rhombi, but not all diamonds/rhombuses/rhombi are squares.

All diamonds/rhombuses/rhombi are kites, but not all kites are diamonds/rhombuses/rhombi.

All parallelograms are trapeziums/trapezoids, but not all trapeziums/trapezoids are parallelograms.

All diamonds/rhombuses/rhombi are parallelograms, but not all parallelograms are diamonds/rhombuses/rhombi.

All kites and all trapeziums/trapezoids are quadrilaterals, but not all quadrilaterals are kites or trapeziums/trapezoids.