sexogon
The name of a fifteen sided polygon is known to have two names : pentakaidecagon, pentadecagon John Irving Dr. Math
The interior angles of a fifteen sided polygon amount to 2340 degrees.
Pentadecagon, Quindecagon, PentakaidecagonA polygon with fifteen sides can be called a pentadecagon.
The measure of each interior angle of a fifteen sided regular polygon, a pendedecagon, is 156o.
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The interior angles of a 15 sided polygon sum to 2340 degrees
pendedecagon and it is 2,340 degrees if it is a regular pendedecagon it angles are each 156 degrees
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The names of polygons with sides ranging from 21 to 30 are as follows: a 21-sided polygon is called a icosagon, a 22-sided polygon is a dicosagon, a 23-sided polygon is a tricosagon, a 24-sided polygon is a tetracosagon, a 25-sided polygon is a pentacosagon, a 26-sided polygon is a hexacosagon, a 27-sided polygon is a heptacosagon, a 28-sided polygon is an octacosagon, a 29-sided polygon is a nonacosagon, and a 30-sided polygon is a triacontagon.
A five sided polygon is called a pentagon because pentagon means five sided polygon I think.
An 11 sided polygon is a hendecagon and a 12 sided polygon is a dodecagon