If there are more children than elderly people, the chart will have the shape of a true pyramid. Take 1950, for example. Here, the post-war baby boom generation is clearly visible. Nowadays, only the ...

If there are more children than elderly people, the chart will have the shape of a true pyramid. Take 1950, for example. Here, the post-war baby boom generation is clearly visible. Nowadays, only the ...

The net of a 3D shape is what it looks like if it is opened out flat. There are many types of nets for the different 3D shapes. A net is made from polygons that can be folded and joined ...