The polygon of seven(7) sides is named an 'HEPTAGON'.
For the given number of sides of other polygons, the prefix is
3 = tri ( trigon / triangle)
4 = tetragon ( rectangle/ quadrilaterial)
5 = penta
6 = hexa
7 = hepta ( as above)
8 = octa
9 = nona
10 = deca.
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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.
square
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.