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A set square is used in technical drawing, providing a straightedge at a right angle or another particular planar angle to a baseline. They are commonly made from clear plastic. The most common set squares are 45° squares, (one 90° corner and two 45° corners) and 60/30 triangles (a 90°, a 60° and a 30° corner).
A similar chair has been preserved by the National Museum of Scotland, however the seat of this chair is supported by four round-top legs which are transfixed at right angles by the seat rails. [34] In a tomb belonging to Senenmut's mother Hatnofer a chair made of boxwood and ebony has been found. The seat of the chair was made of string mesh ...
The Parsons table is a modernist square or rectangular table whose four legs are square in cross-section, flush with the edges of the top, and equal to it in thickness. [ 1 ] The Parsons table was designed by Jean-Michel Frank while he was working at Parsons Paris , then known as the Paris Atelier.
Many examples of Shaker furniture survive and are preserved today, including such popular forms as Shaker tables, chairs, rocking chairs (made in several sizes), and cabinets, which are said to have Shaker doors, known for being flat paneled with rail frames. [5] Shaker furniture varies widely in price.
These set squares come in two usual forms, both right triangles: one with 90-45-45 degree angles, the other with 30-60-90 degree angles. Combining the two forms by placing the hypotenuses together will also yield 15° and 75° angles. They are often purchased in packs with protractors and compasses. Less commonly found is the adjustable set square.
In Euclidean geometry, a square is a regular quadrilateral, which means that it has four straight sides of equal length and four equal angles (90-degree angles, π /2 radian angles, or right angles). It can also be defined as a rectangle with two equal-length adjacent sides.