In 2-d, items are flat, like triangles or circles
In 3-d things have height, like boxes or spheres
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The extra dimension: depth.
2 - 5 = -3 5 - 2 = 3
Difference is a subtraction word. What is the difference between 5 and 2 = 3
The difference is 2 and 7 eighths.
It is 5.