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In American English
American English

PhonologyIn many ways, compared to English language in England, North American English is conservative in its phonology. Some distinctive accents can be found on the East Coast of the United States , partly because these areas were in contact with England, and imitated prestigious varieties of English English at a time when those varieties we...
, a set square is an alternative name for a T-square
T-square

A T-square is a technical drawing instrument primarily a guide for drawing horizontal lines on a drafting table. It is used by draftsmen. It is also used to guide the triangle that draws vertical lines....
.


A set square or triangle (American English
American English

PhonologyIn many ways, compared to English language in England, North American English is conservative in its phonology. Some distinctive accents can be found on the East Coast of the United States , partly because these areas were in contact with England, and imitated prestigious varieties of English English at a time when those varieties we...
) is an object used in engineering and technical drawing
Technical drawing

File:Drafter at work.jpgFile:Bundesarchiv B 145 Bild-F038800-0010, Wolfsburg, VW Autowerk.jpgTechnical drawing is the discipline of creating Standardization technology drawing by architects, CAD drafters, design engineers, and related professionals....
, with the aim of providing a straightedge
Straightedge

A straightedge is a tool with an accurately straight edge used for drawing or cutting straight lines, or checking the straightness of lines. If it has equally spaced markings along its length it is usually called a ruler....
 at a right angle
Right angle

In geometry and trigonometry, a right angle is an angle of 90 degree s, corresponding to a quarter turn . It can be defined; as the angle such that twice that angle amounts to a half turn, or 180?....
 or other particular planar angle to a baseline
Baseline

The word baseline may refer to:* baseline is the process of managing change in hardware, software, firmware, documentation, measurements, etc....
.

The most simple form of set square is a triangular piece of transparent plastic
Plastic

Plastic is the general common term for a wide range of synthetic or semisynthetic organic chemistry solid materials suitable for the manufacture of industrial products....
 (or formerly of polished wood) with the centre removed.






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Aristo Geo Dreieck 1550 Indiziert Transparent
In American English
American English

PhonologyIn many ways, compared to English language in England, North American English is conservative in its phonology. Some distinctive accents can be found on the East Coast of the United States , partly because these areas were in contact with England, and imitated prestigious varieties of English English at a time when those varieties we...
, a set square is an alternative name for a T-square
T-square

A T-square is a technical drawing instrument primarily a guide for drawing horizontal lines on a drafting table. It is used by draftsmen. It is also used to guide the triangle that draws vertical lines....
.


A set square or triangle (American English
American English

PhonologyIn many ways, compared to English language in England, North American English is conservative in its phonology. Some distinctive accents can be found on the East Coast of the United States , partly because these areas were in contact with England, and imitated prestigious varieties of English English at a time when those varieties we...
) is an object used in engineering and technical drawing
Technical drawing

File:Drafter at work.jpgFile:Bundesarchiv B 145 Bild-F038800-0010, Wolfsburg, VW Autowerk.jpgTechnical drawing is the discipline of creating Standardization technology drawing by architects, CAD drafters, design engineers, and related professionals....
, with the aim of providing a straightedge
Straightedge

A straightedge is a tool with an accurately straight edge used for drawing or cutting straight lines, or checking the straightness of lines. If it has equally spaced markings along its length it is usually called a ruler....
 at a right angle
Right angle

In geometry and trigonometry, a right angle is an angle of 90 degree s, corresponding to a quarter turn . It can be defined; as the angle such that twice that angle amounts to a half turn, or 180?....
 or other particular planar angle to a baseline
Baseline

The word baseline may refer to:* baseline is the process of managing change in hardware, software, firmware, documentation, measurements, etc....
.

The most simple form of set square is a triangular piece of transparent plastic
Plastic

Plastic is the general common term for a wide range of synthetic or semisynthetic organic chemistry solid materials suitable for the manufacture of industrial products....
 (or formerly of polished wood) with the centre removed. More commonly the set square combines this with a ruler
Ruler

A ruler, or rule, is an Measuring instrument used in geometry, technical drawing and engineering/building to measure distances and/or to rule straight lines....
 and a half circle protractor
Protractor

In geometry, a protractor is a circular or semicircular tool for measuring an angle or a circle. The units of measurement utilized are usually degree s....
, like on the picture. The outer edges are typically bevel
Bevel

A beveled edge refers to an edge of a structure that is not perpendicular to the faces of the piece. The words bevel and chamfer overlap in usage; in general usage they are often interchanged, while in technical usage they may sometimes be differentiated as shown in the image at right....
led. 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. They are often purchased in packs with protractor
Protractor

In geometry, a protractor is a circular or semicircular tool for measuring an angle or a circle. The units of measurement utilized are usually degree s....
s and compasses
Compass (drafting)

A compass or, more properly, pair of compasses is a technical drawing instrument that can be used for inscribing circles or Arc s. They can also be used as a tool to measure distances, in particular on maps....
.

Less commonly found is the adjustable set square. Here, the body of the object is cut in half and rejoined with a hinge
Hinge

A hinge is a type of Bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation ....
 marked with angles. Adjustment to the marked angle will produce any desired angle up to a maximum of 180°.

See also

  • Polydrafter
    Polydrafter

    In recreational mathematics, a polydrafter is a polyform with a triangle as the base form. The triangle has angles of 30?, 60? and 90?, like a —hence the name....
  • Special right triangles
    Special right triangles

    A special right triangle is a right triangle with some regular feature that makes calculations on the triangle easier, or for which simple formulas exist....