- Adolph Menzel (Wikipedia)
Adolph Friedrich Erdmann von Menzel (8 December 1815 – 9 February 1905) was a German Realist artist noted for drawings, etchings, and paintings. Along with Caspar David Friedrich, he is considered one of the two most prominent German painters of the 19th century, and was the most successful artist of his era in Germany. First known as Adolph Menzel, he was knighted in 1898 and changed his name to Adolph von Menzel.
- Equilateral triangle (Wikipedia)
In geometry, an equilateral triangle is a triangle in which all three sides have the same length. In the familiar Euclidean geometry, an equilateral triangle is also equiangular; that is, all three internal angles are also congruent to each other and are each 60°. It is also a regular polygon, so it is also referred to as a regular triangle.
