4-sided shapes, because if you think about it, triangles (3-sided shapes) aren't that varied in sizes and types. 4-sided shapes can be as crazy as possible, so... yeah. 4-sided shapes are definitely more varied in drawing forms.
Cells are different shapes and sizes because they have different functions. The functions dictate the shapes and sizes.
There are different formulae for different shapes.
If they are the same shapes but differ only in size, then they are SIMILAR shapes. Otherwise, they are simply different shapes.
Yes - even shapes with different area.
To perform different functions plant cells assume different shapes
Yes many different shapes can have the same volume
Organic shapes are shapes with a natural look and a flowing and curving appearance.
Because animals are all different shapes and sizes
cars are different shapes to change the speed, gas mileage, and design.
popcorn gets different shapes because as the water in the kernel gets hotter it starts boiling and expands creating different size and shapes popcorns
aluminum comes in different shapes.
Because you have to use different shapes in your life.