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  2. Perimeter - Wikipedia

    en.wikipedia.org/wiki/Perimeter

    Perimeter is the distance around a two dimensional shape, a measurement of the distance around something; the length of the boundary. A perimeter is a closed path that encompasses, surrounds, or outlines either a two dimensional shape or a one-dimensional length. The perimeter of a circle or an ellipse is called its circumference.

  3. Third grade - Wikipedia

    en.wikipedia.org/wiki/Third_grade

    Third grade (also 3rd Grade or Grade 3) is the third year of formal or compulsory education. It is the third year of primary school. Children in third grade are ...

  4. Area - Wikipedia

    en.wikipedia.org/wiki/Area

    This formula is also known as the shoelace formula and is an easy way to solve for the area of a coordinate triangle by substituting the 3 points (x 1,y 1), (x 2,y 2), and (x 3,y 3). The shoelace formula can also be used to find the areas of other polygons when their vertices are known.

  5. Geometry - Wikipedia

    en.wikipedia.org/wiki/Geometry

    The Math Forum – College Geometry; The Math Forum – Advanced Geometry; Nature Precedings – Pegs and Ropes Geometry at Stonehenge; The Mathematical Atlas – Geometric Areas of Mathematics "4000 Years of Geometry", lecture by Robin Wilson given at Gresham College, 3 October 2007 (available for MP3 and MP4 download as well as a text file)

  6. Shoelace formula - Wikipedia

    en.wikipedia.org/wiki/Shoelace_formula

    Shoelace scheme for determining the area of a polygon with point coordinates (,),..., (,). The shoelace formula, also known as Gauss's area formula and the surveyor's formula, [1] is a mathematical algorithm to determine the area of a simple polygon whose vertices are described by their Cartesian coordinates in the plane. [2]

  7. Heronian triangle - Wikipedia

    en.wikipedia.org/wiki/Heronian_triangle

    In geometry, a Heronian triangle (or Heron triangle) is a triangle whose side lengths a, b, and c and area A are all positive integers. [1] [2] Heronian triangles are named after Heron of Alexandria, based on their relation to Heron's formula which Heron demonstrated with the example triangle of sides 13, 14, 15 and area 84.