An equilateral figure means that the figure has all sides that are the same length.
inscribed angles
A plane figure with 4 unequal sides is a quadralateral.
A seven sided figure would be a heptagon. A Reuleaux heptagon, is a seven sided figure, but having constant diameter. [As seen in some British coins]. But a regular heptagon would have seven equal sides that were each straight.
square
heptagon
It is a heptagon.
5Improved Answer:-An heptagon has 7 sides but a pentagon has 5 sides
Heptagon .
7
A Septagon from the greek Sept meaning 7
A plane figure with 7 straight sides
heptagon.
It is called a heptagon or a septagon,
A closed figure with seven sides is a "heptagon." It is sometimes also called a "septagon."
It is called a heptagon, from the Greek word for seven.
There is no figure with a greatest number of sides. For any figure with n sides, there will be a figure with n+1 sides.