All regular decagons have the same shape, like this: An irregular decagon is a 10 sides shape where not every side and angle are equal. A regular decagon is a 10-sided shape where every side is the same length and every corner has the same angle. In a regular hexagon, the three long diagonals are also lines of symmetry, however, the short diagonals are not. A decagon is a flat shape with 10 straight sides. What is a heptagon Heptagon shape Regular heptagon Irregular heptagon Area of a heptagon Heptagons in real life What is a heptagon A heptagon is a 7-sided polygon with 7 interior angles that sum to 900°.The name heptagon derives from the Greek words hepta- for seven and gon- for sides. This is simpler, and more useful, than inventing fancy names for figures of different number of sizes. For such large numbers as this, hust call it a '200-sided polygon'. Confusing diagonals and lines of symmetryīe careful not to confuse diagonals with lines of symmetry. A shape with three linear sides and one curved side can be drawn, but such a shape has no specific name.Exterior angles are formed between a polygon and the extended line from the vertex (corner) of the polygon. The Interior angles of a regular hexagon are formed inside the shape, where two sides meet and form a vertex (corner). Mixing up the interior or exterior anglesīe careful not to confuse interior and exterior angles.If the question does not tell us, use the appropriate properties of polygons to identify regularity or irregularity.įor example, the hexagon below looks regular at a glance, however, you can see from the diagram that two interior angles are labeled, and they are not equal.įor a polygon to be regular, all six interior angles must be equal in size. ![]() Learn more about Pentagon, Regular and Irregular Pentagons and their shape with Formulas, Definitions, Examples, Properties, Area, Perimeter, etc. ![]() ![]() Be careful to never assume a polygon is regular or irregular. In geometry, a pentagon is a five-sided polygon with five straight sides and five interior angles, which add up to 540°.
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