Equilateral triangle
Shape with three equal sides
Equilateral triangle
An equilateral triangle is a triangle with three sides of equal length and three equal angles. It is a regular polygon, occasionally known as the regular triangle. It is a special case of an isosceles triangle by modern definition. Its internal angle is 60 degrees or π/3 radians. Its perimeter is three times the side length. Its area is a quarter of the square root of three multiplied with its squared side length. Its appearance is unchanged by three reflection lines, each of which passing through a vertex to the midpoint of the opposite edge, and three rotations around its centroid (0°, 120°, 240°); this property is related to the dihedral group of order 6 in algebra. Applications of an equilateral triangle are in popular culture, architecture, and other science fields such as the resemblance of the trigonal planar molecular geometry in stereochemistry, ternary plots in several fields, Einthoven's triangle in electrocardiography, as a solution of the Thomson problem and of the celestial...
Read on Wikipedia · Image Alexander Pavlov (user:Saaska); Some corrections by Incnis Mrsi, Public domain
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