How to tell a square, rhombus, and diamond apart visually?

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Detailed Solution

Here is a simple visual guide to tell these three shapes apart. The key differences are the angles and the orientation.

1. Square

2. Rhombus (Non-Square)

Sides: All four sides are the exact same length (just like a square).
Angles: The angles are NOT 90 degrees. It has two opposite "pointy" (acute) angles and two opposite "wide" (obtuse) angles.
Look: It looks like a "slanted square" or a "pushed-over box."

3. Diamond

What it is: "Diamond" is an informal name for a rhombus. It is not a formal geometric shape.
When it's used: This term is almost exclusively used when a rhombus (or a square) is rotated to stand on one of its vertices (corners).
Look: The "diamond" from a deck of cards is a non-square rhombus. A baseball "diamond" is a square. The name "diamond" refers more to its orientation than its specific geometric properties.

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