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The perimeter
The perimeter is both on the outside and the inside of a shape, as it is basically the outside wall/border of a shape and can therefore be viewed from the outside or the inside.
The polygon with four unequal sides is known as a trapezium. Outside of North America is called a general irregular quadrilateral.
it is called a seven sided shape in Canada
A 90 sided shape is called Enneacontagon.