Because a rhombus is not a diamond. Really, a diamond isn't a real shape.
'Diamond' is from decks of cards, 'Rhombus' is from Math. BTW, a rhombus is a parallelogram* with opposite acute** and obtuse*** angles and all four sides are the same length.
*opposite sides of the shape are parallel
**less than 90
***more than 90 degrees
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A rhombus is often called a diamond.
In mathematical terms it's called a rhombus.
Diamond Or cone * * * * * Partly correct. A rhombus can be called a diamond or a parallelogram or a quadrilateral. However, a rhombus is a 2-dimensional figure whereas a cone is 3-dimensional so you certainly could not call a rhombus a cone.
It could be called a kite, a rhombus or a square. This depends on the perspective, length and angles of the diamond.
A rhombus is simply a 4 sided shape (quadrilateral) with all 4 sides having the same length. It is often called a diamond since it looks the the diamond that in on playing cards. Squares are one type of rhombus where all the angles are 90 degrees (right angles.)