See our pages on circles and curved shapes for more. They are also used in various other fields such as engineering, design, and mathematics. Heptagon shapes are very popular in the world of art and architecture. It is also the name of a shape that is made up of seven triangles. Any other polygon is an irregular polygon, which by definition has unequal length sides and unequal angles between sides.Ĭircles and shapes that include curves are not polygons - a polygon, by definition, is made up of straight lines. Heptagon: A heptagon is a polygon with seven sides. We tend to encounter polygons mostly while we learn about geometry. There are two main types of polygon - regular and irregular.Ī regular polygon has equal length sides with equal angles between each side. Polygons are defined as two-dimensional closed shapes that are formed by joining three or more line segments with each other. There are names for many different types of polygons, and usually the number of sides is more important than the name of the shape. The ‘poly-‘ prefix simply means ‘multiple’, so a polygon is a shape with multiple sides, in the same way that ‘polygamy’ means multiple spouses. An Olympic heptathlon has seven events – a heptagon has seven sides.The modern pentathlon has five events – a pentagon has five sides.seven 2 triangle ( 3 ) 25 1 sextrahedron 1 trigonometry 43245 1 12 3 shape. A decade is ten years – a decagon has ten sides. sided ( 1 ) 7 many sided carbon ( 3 ) 8 geography.An octopus has eight legs – an octagon has eight sides.These can sometimes be useful in helping you remember how many sides a polygon has. The Greek numerical prefix occurs in many names of everyday objects and concepts. The names of polygons are derived from the prefixes of ancient Greek numbers. One with one obtuse angle and two acute angles is called obtuse (obtuse-angled), and one with a right angle is known as right-angled.Įach of these will also be either equilateral, isosceles or scalene. The internal angles of a triangle always add up to 180°.Ī triangle with only acute internal angles is called an acute (or acute-angled) triangle. Triangles can also be described in terms of their internal angles (see our page on Angles for more about naming angles). Scalene – all three sides, and all three internal angles, are different.Isosceles – has two equal sides, with the third one a different length.Equilateral – all the sides are equal lengths, and all the internal angles are 60°.There are several different types of triangle (see diagram), including: Three-Sided Polygons: TrianglesĪ three-sided polygon is a triangle. Polygons are usually defined by the number of sides that they have. The angles between the sides of the shape.When working with polygons the main properties which are important are:
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