An octagon (like a STOP sign).
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octogon
An octagon is commonly known for having 8 sides and 8 angles.
Triangle = 3 sides 3 angles Square = 4 sides 4 angles Hexagon = 5 sides 5 angles Pentagon = 6 sides 6 angles No certain name for 7 sides and 7 angles Octagon = 8 sides 8 angles Nonagon = 9 sides 9 angles Decagon = 10 sides 10 angles
The sum of the interior angles of a polygon is 2n - 4 right angles - where n is the number of sides. So, 1080° = 1080/90 = 12 right angles If 2n - 4 = 12 then 2n = 16 : n = 8 The number of sides is 8.
If the sides are all equal, and opposite sides are parallel, then the angles are all equal (72º) and it is a 'regular hexagon'. A six sided plane figure is called a hexagon, as "hex" means "six."