Set Square

A set square or triangle (American English) is an object used in engineering and technical drawing, with the aim of providing a straightedge at a right angle or other particular planar angle to a baseline.

The most simple form of set square is a triangular piece of transparent plastic (or formerly of polished wood) with the centre removed. More commonly the set square bears the markings of a ruler and a half circle protractor. The outer edges are typically bevelled. 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. Here, the body of the object is cut in half and rejoined with a hinge marked with angles. Adjustment to the marked angle will produce any desired angle up to a maximum of 180°.

Other articles related to "set":

Oh, Hell - Scoring
... one's own contract by severely overtricking in order to "set" someone else ... Exact scoring with set penalty A player who makes the exact number of tricks bid scores 10 plus the amount bid ... Players who overbid have "gone set" and lose 10 points, regardless of the number of tricks taken ...

Famous quotes containing the words square and/or set:

    This house was designed and constructed with the freedom of stroke of a forester’s axe, without other compass and square than Nature uses.
    Henry David Thoreau (1817–1862)

    [My mother told me:] “You must decide whether you want to get married someday, or have a career.”... I set my sights on the career. I thought, what does any man really have to offer me?
    Annie Elizabeth Delany (b. 1891)