In mathematics (and more specifically geometry), a semicircle is a one-dimensional locus of points that forms half of a circle.The full arc of a semicircle always measures 180° (equivalently, π radians, or a half-turn).It has only one line of symmetry (reflection symmetry).In non-technical usage, the term "semicircle" is sometimes used to refer to a half-disk, which is a two …

Archimedes of Syracuse (/ ˌ ɑːr k ɪ ˈ m iː d iː z /; c. 287 – c. 212 BC) was a Greek mathematician, physicist, engineer, astronomer, and inventor from the ancient city of Syracuse in Sicily. Although few details of his life are known, he is regarded as one of the leading scientists in classical antiquity.Considered to be the greatest mathematician of ancient history, and one of the ...

A knife (PL: knives; from Old Norse knifr 'knife, dirk') is a tool or weapon with a cutting edge or blade, usually attached to a handle or hilt.One of the earliest tools used by humanity, knives appeared at least 2.5 million years ago, as evidenced by the Oldowan tools. Originally made of wood, bone, and stone (such as flint and obsidian), over the centuries, in step with …

The optimal packing density of the Reuleaux triangle in the plane remains unproven, but is conjectured to be +,which is the density of one possible double lattice packing for these shapes. The best proven upper bound on the packing density is approximately 0.947275. It has also been conjectured, but not proven, that the Reuleaux triangles have the highest packing density of …

In 1996, Marshall Bern and Barry Hayes showed to be an NP-complete problem the assignation of a crease pattern of mountain and valley folds in order to produce a flat origami structure starting from a flat sheet of paper. In 1999, a theorem due to Haga provided constructions used to divide the side of a square into rational fractions. In late 2001 and early 2002, Britney Gallivan proved …

The earliest known work on conic sections was by Menaechmus in the 4th century BC. He discovered a way to solve the problem of doubling the cube using parabolas. (The solution, however, does not meet the requirements of compass-and-straightedge construction.)The area enclosed by a parabola and a line segment, the so-called "parabola segment", was computed …

List of Wii U games Title Genre Developer(s) Publisher(s) Release date Ref. Japan North America Australasia Europe 007 Legends: First-person shooter

This is a list of two-dimensional geometric shapes in Euclidean and other geometries.For mathematical objects in more dimensions, see list of mathematical shapes.For a broader scope, see list of shapes

Bereits vor der Erfindung des Papiers (rund 100 v. Chr. in China) wurden Stoffe und andere Materialien gefaltet.. Im Jahr 610 wurde das Papier durch buddhistische Mönche von China nach Japan gebracht, wo das Papierfalten in der Muromachi-Zeit (1333–1568) eine erste und in der Edo-Zeit (1603–1868) eine zweite Blüte erlebte. Da Papier zu jener Zeit recht teuer war, war es …

The Last Movie is a 1971 metafictional drama film directed and edited by Dennis Hopper, who also stars in the leading role as a horse wrangler named after the state of Kansas.It is written by Stewart Stern, based on a story by Hopper and Stern, and stars an extensive supporting cast that includes Stella Garcia, Don Gordon, Peter Fonda, Julie Adams, Sylvia Miles, Samuel Fuller, …