There is a formula for the total of the interior angles. A triangle (3 sides) adds up to 180°. A quadrilateral adds up to 360°. A pentagon adds up to 540° and a hexagon adds up to 720°. Notice that for each additional side, the sum of the interior angles increases by 180°.
The general formula for an 'n' sided polygon is:
(n-2) * 180°
So (6-2) * 180°
= 4 * 180° = 720° (like I said before)
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The name of a 16 sided polygon is Hexadecagon.
The name of a 21 sided polygon is Icosihenagon.
The sum of the interior angles of a four-sided polygon is 360 degrees.
A six-sided polygon is called a hexagon
The sum of the exterior angles of any n-sided regular polygon, including a seven-sided polygon, is 360 degrees.