منابع مشابه
Heptagonal Triangles and Their Companions
A heptagonal triangle is a non-isosceles triangle formed by three vertices of a regular heptagon. Its angles are π 7 , 2π 7 and 4π 7 . As such, there is a unique choice of a companion heptagonal triangle formed by three of the remaining four vertices. Given a heptagonal triangle, we display a number of interesting companion pairs of heptagonal triangles on its nine-point circle and Brocard circ...
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that his/her monozygotic twin and a 39% chance that a dizygotic twin will also be dyscalculic. The link also exists between dyscalculics' parents and siblings: around half of the all first-degree family members of a dyscalculic also have dyscalculia (mothers, 67%; fathers, 41%; brothers, 53%; sisters, 52%), and 43% of the second-degree relatives. This prevalence is around tenfold higher than e...
متن کاملSome Collinearities in the Heptagonal Triangle
With the methods of barycentric coordinates, we establish several collinearities in the heptagonal triangle, formed by a side and two diagonals of different lengths of a regular heptagon. 1. The regular heptagon Consider a regular heptagon AA′C ′A′′BCB′ inscribed in a circle, each side of length a. The diagonals are of two kinds. Those with 3 vertices on the defining minor arc have the same len...
متن کاملOn A Fullerene with 458 Carbons Containing 8 heptagonal rings
A Fullerene with pentagons, hexagons, and heptagons is considered. The number of carbons is 458. It contains 8 heptagonal rings, 21 pentagons, and 212 hexagons. Keywords-component; fullerene; heptagon; pentagon adjacency penalty rule; fullerene with many carbons
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ژورنال
عنوان ژورنال: Euclid
سال: 2019
ISSN: 2541-4453,2355-1712
DOI: 10.33603/e.v6i1.1294