Equilateral pentagon of δ can be seen from the figure: Simplifying, δ is obtained as function of α and β: The remaining angles of the pentagon can be found geometrically: The remaining angles of the orange and blue triangles are readily found by noting that two angles of an isosceles triangle are equal while all three angles sum to 180°. Then formula_7 and the two remaining angles of the green triangle can be found from four equations stating that the sum of the angles of the pentagon is 540°, the sum of the angles of the green triangle is 180°, the angle
Angles Angles The Angles () were one of the main Germanic peoples who settled in Great Britain in the post-Roman period. They founded several of the kingdoms of Anglo-Saxon England, and their name is the root of the name England. The name comes from Anglia, a peninsula located on the Baltic shore of what is now Schleswig-Holstein. The name of the Angles may have been first recorded in Latinised form, as "Anglii", in the "Germania" of Tacitus. It is thought to derive from the name of the area they originally inhabited, the Anglia Peninsula ("Angeln" in modern German, "Angel" in Danish).