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  2. Squaring the circle - Wikipedia

    en.wikipedia.org/wiki/Squaring_the_circle

    Squaring the circle is a problem in geometry first proposed in Greek mathematics.It is the challenge of constructing a square with the area of a given circle by using only a finite number of steps with a compass and straightedge.

  3. Straightedge and compass construction - Wikipedia

    en.wikipedia.org/wiki/Straightedge_and_compass...

    The most famous of these problems, squaring the circle, otherwise known as the quadrature of the circle, involves constructing a square with the same area as a given circle using only straightedge and compass. Squaring the circle has been proved impossible, as it involves generating a transcendental number, that is, √ π.

  4. Compass (drawing tool) - Wikipedia

    en.wikipedia.org/wiki/Compass_(drawing_tool)

    A beam compass and a regular compass Using a compass A compass with an extension accessory for larger circles A bow compass capable of drawing the smallest possible circles. A compass, also commonly known as a pair of compasses, is a technical drawing instrument that can be used for inscribing circles or arcs.

  5. Square (tool) - Wikipedia

    en.wikipedia.org/wiki/Square_(tool)

    A square is a tool used for marking and referencing a 90° angle, though mitre squares are used for 45° angles. Squares see common use in woodworking, ...

  6. Tarski's circle-squaring problem - Wikipedia

    en.wikipedia.org/wiki/Tarski's_circle-squaring...

    Tarski's circle-squaring problem is the challenge, posed by Alfred Tarski in 1925, [1] to take a disc in the plane, cut it into finitely many pieces, and reassemble the pieces so as to get a square of equal area. It is possible, using pieces that are Borel sets, but not with pieces cut by Jordan curves.

  7. Sector (instrument) - Wikipedia

    en.wikipedia.org/wiki/Sector_(instrument)

    There is a circle on the scale that lies nearly midway between 6 and 7. The name comes from tetragon (quadrilateral), as the main purpose of these lines is the quadrature of regular polygons, that is, finding the side of a square whose area is the same as the given regular polygon. They can also be used to square the circle.

  8. Squircle - Wikipedia

    en.wikipedia.org/wiki/Squircle

    Squircle centred on the origin (a = b = 0) with minor radius r = 1: x 4 + y 4 = 1A squircle is a shape intermediate between a square and a circle.There are at least two definitions of "squircle" in use, one based on the superellipse, the other arising from work in optics.

  9. Beam compass - Wikipedia

    en.wikipedia.org/wiki/Beam_compass

    The circle cutter is a basic variation of the beam compass. There are many types of circle cutters. This cutter is used primarily to score a circular pattern in the drywall to fit over recessed lighting in the ceiling. The tool consists of a square shank with a sliding pivot that is locked into the desired location with a turn knob.