Three-dimensional (3D) refers to objects that have length, width, and height, such as a box or the human body. Unlike uniform shapes, 3D shapes can vary in appearance but still occupy physical space. The document emphasizes the concept of 3D shapes in a relatable manner.

1. 3 D MEANS THREE-DIMENSIONAL, OR HAVING
THREE DIMENSIONS. FOR EXAMPLE, A BOX IS
THREE-DIMENSIONAL

2. 
Think about your own body for a
minute. Your body is a 3D shape. It
is not a uniform shape, like a
building block, but it is a 3D shape.
An easy way to think of a 3D
shape is any shape or object that
takes up air space.
OOKAAY....

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8. Mind Freshener