It looks as if the cursor has played tricks and changed the wording from a regular heptagon to regagonular hept.
A regular heptagon has no parallel sides.
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A polygon with 7 sides is a heptagon. (hept- = 7)
It means 7 as in an heptagon which has 7 sides
9 million, 100, and 72
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The prefixes sept(a)- and hept(a)- may both be used for seven. The month of September was originally the seventh in the Roman calendar.