Right angle Right angle In geometry and trigonometry, a right angle is an angle of exactly 90° (degrees), corresponding to a quarter turn. If a ray is placed so that its endpoint is on a line and the adjacent angles are equal, then they are right angles. The term is a calque of Latin "angulus rectus"; here "rectus" means "upright", referring to the vertical perpendicular to a horizontal base line. Closely related and important geometrical concepts are perpendicular lines, meaning lines that form right angles at their point of intersection, and orthogonality, which is the property of forming right angles, usually applied
Poem of the Right Angle some of Le Corbusier's paintings from the 1930s. It is orthogonal, architectural and labyrinthine. F.3. The symbol of the open hand appears as an "offering", and the interior lines and contours reveal traits and hidden characteristics. E.3. The presentation of a "tool" is an analogy to the Philosopher's stone, both the solution and the question, thus establishing the cyclical nature of the work. Poem of the Right Angle The Poem of the Right Angle ("Le Poeme de l'Angle Droit") is a series of 19 paintings and corresponding writings composed by the influential Swiss-French architect Le Corbusier between 1947 and 1953.