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  2. Square - Wikipedia

    en.wikipedia.org/wiki/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.

  3. Quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Quadrilateral

    A quadric quadrilateral is a convex quadrilateral whose four vertices all lie on the perimeter of a square. [7] A diametric quadrilateral is a cyclic quadrilateral having one of its sides as a diameter of the circumcircle. [8] A Hjelmslev quadrilateral is a quadrilateral with two right angles at opposite vertices. [9]

  4. Rectangle - Wikipedia

    en.wikipedia.org/wiki/Rectangle

    In Euclidean plane geometry, a rectangle is a rectilinear convex polygon or a quadrilateral with four right angles. It can also be defined as: an equiangular quadrilateral, since equiangular means that all of its angles are equal (360°/4 = 90°); or a parallelogram containing a right angle. A rectangle with four sides of equal length is a square.

  5. Square (disambiguation) - Wikipedia

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

    A square is a regular quadrilateral with four equal sides and four right angles. ... also called a "framing" or "carpenter's" square, produces right angles;

  6. Parallelogram - Wikipedia

    en.wikipedia.org/wiki/Parallelogram

    Rhombus – A parallelogram with four sides of equal length. Any parallelogram that is neither a rectangle nor a rhombus was traditionally called a rhomboid but this term is not used in modern mathematics. [1] Square – A parallelogram with four sides of equal length and angles of equal size (right angles).

  7. Right angle - Wikipedia

    en.wikipedia.org/wiki/Right_angle

    A rectangle is a quadrilateral with four right angles. A square has four right angles, in addition to equal-length sides. The Pythagorean theorem states how to determine when a triangle is a right triangle.

  8. NYC ad agency titans Omnicom and Interpublic to form $30 ...

    www.aol.com/omnicom-buy-interpublic-creating-ad...

    Omnicom is buying Interpublic Group in a stock-for-stock deal that will create the largest ad agency in the world with combined annual revenue of almost $26 billion. The names may be unfamiliar to ...

  9. Van Aubel's theorem - Wikipedia

    en.wikipedia.org/wiki/Van_Aubel's_theorem

    Van Aubel's theorem states that the two line segments between the centers of opposite squares are of equal lengths and are at right angles to one another. Another way of saying the same thing is that the center points of the four squares form the vertices of an equidiagonal orthodiagonal quadrilateral .