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  2. Rectilinear polygon - Wikipedia

    en.wikipedia.org/wiki/Rectilinear_polygon

    Some examples of rectilinear polygons. A rectilinear polygon is a polygon all of whose sides meet at right angles. Thus the interior angle at each vertex is either 90° or 270°. Rectilinear polygons are a special case of isothetic polygons.

  3. Equable shape - Wikipedia

    en.wikipedia.org/wiki/Equable_shape

    For example, if shape has an area of 5 square yards and a perimeter of 5 yards, then it has an area of 45 square feet (4.2 m 2) and a perimeter of 15 feet (since 3 feet = 1 yard and hence 9 square feet = 1 square yard). Moreover, contrary to what the name implies, changing the size while leaving the shape intact changes an "equable shape" into ...

  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.

  5. File:Oak National Academy KS3 Maths- lesson-1-in-perimeter ...

    en.wikipedia.org/wiki/File:Oak_National_Academy...

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  6. Taxicab geometry - Wikipedia

    en.wikipedia.org/wiki/Taxicab_geometry

    The taxicab distance is also sometimes known as rectilinear distance or L 1 distance (see L p space). [1] This geometry has been used in regression analysis since the 18th century, and is often referred to as LASSO. Its geometric interpretation dates to non-Euclidean geometry of the 19th century and is due to Hermann Minkowski.

  7. Polygon - Wikipedia

    en.wikipedia.org/wiki/Polygon

    Rectilinear: the polygon's sides meet at right angles, i.e. all its interior angles are 90 or 270 degrees. Monotone with respect to a given line L : every line orthogonal to L intersects the polygon not more than twice.

  8. Roundness - Wikipedia

    en.wikipedia.org/wiki/Roundness

    A common definition used in digital image processing (image analysis) for characterizing 2-D shapes is: Roundness = ⁠ Perimeter 2 / 4 π × Area ⁠. This ratio will be 1 for a circle and greater than 1 for non-circular shapes. Another definition is the inverse of that: Roundness = ⁠ 4 π × Area / Perimeter 2 ⁠,

  9. Projective geometry - Wikipedia

    en.wikipedia.org/wiki/Projective_geometry

    Its rigorous foundations were addressed by Karl von Staudt and perfected by Italians Giuseppe Peano, Mario Pieri, Alessandro Padoa and Gino Fano during the late 19th century. [4] Projective geometry, like affine and Euclidean geometry , can also be developed from the Erlangen program of Felix Klein; projective geometry is characterized by ...

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