How_To_Be_Good_At_Math

222 GEOMETRY • 3D SHAPES

WIDTH LENGTH

3D shape

Three-dimensional, or 3D shapes, are shapes that

have length, width, and height. A 3D object can be

solid, like a lump of rock, or hollow, like a football.

Look at this picture of a greenhouse.

It’s made up of flat surfaces, joins,

and corners. In geometry, these are

called faces, edges, and vertices.

A vertex is

formed where

edges meet

A face is made

of a 2D shape

An edge is

formed where

faces meet

All 3D shapes have three

dimensions: length, width, and

height. A 2D shape only has length

and width or length and height.

HEIGHT

222_223_3D_What_is_3D_shape.indd 222 29/02/2016 18:05