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you call a seven sided shape a heptagon.
A shape with five sides would be a pentagon, but a shape can not have 5 right angles. Squares and Rectangles are both shapes with 4 sides and 4 right angles. They are the only shape with the same amount of right angles as there is sides.
A 30 sided shape is called a Triacontagon.
It is called a trapezium.
A 0-sided shape is called a nullipore or vacuous shape. It is a theoretical concept in mathematics that represents a point in space with no measurable dimensions. In geometric terms, it is often referred to as a "point" or "vertex." This shape has no sides, angles, or any other defining features beyond its position in space.