# Dimensions

## One Dimension

### This is a line. It has one dimension. All one dimensional shapes only have length. The only 1D shape is a line, whether straight or wavy.

## Two Dimensions

### This is a rectangle. It has two dimensions: length and width. All 2D shapes have an area but no depth. Some 2D shapes are triangles, rectangles, pentagons, etc.

## Three Dimensions

### This is a cube. It has three dimensions: length, width, and depth. All 3D shapes are solids.

# 3D Shapes

## CUBE

## PYRAMID

## SPHERE

## CYLINDER

## PRISM

## CONE

## HEMISPHERE

##### Each half is a hemisphere.

## OCTAHEDRON

## DODECAHEDRON

## CUBOID or RECTANGULAR PRISM