D-flat major No. 3 ("Ballade"). Claude Debussy also composed the famous "Clair de lune" in this key, with a significant section in C-sharp minor. Edvard Grieg composed the second movement of his Piano Concerto in D-flat. Frédéric Chopin'sNocturne in D-flat, Op. 27, is in this key. Franz Liszt composed heavily in this key, with his most recognizable piece being the third movement of his piano composition "Trois études de concert", dubbed "Un sospiro". Liszt took advantage of the piano's configuration of the key and used it to create an arpeggiating melody using alternating hands. In orchestral music, the examples are fewer. Gustav
Lune of Hippocrates give the only constructible squarable lunes; in particular, there are no constructible squarable convex lunes. Lune of Hippocrates In geometry, the lune of Hippocrates, named after Hippocrates of Chios, is a lune bounded by arcs of two circles, the smaller of which has as its diameter a chord spanning a right angle on the larger circle. Equivalently, it is a non-convex plane region bounded by one 180-degree circular arc and one 90-degree circular arc. It is the first curved figure to have its exact area calculated mathematically. Hippocrates wanted to solve the classic problem of squaring the circle, i.e. constructing