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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. Pick's theorem - Wikipedia

   en.wikipedia.org/wiki/Pick's_theorem

   Both the area and the counts of points used in Pick's formula add together in the same way as each other, so the truth of Pick's formula for general polygons follows from its truth for triangles. Any triangle subdivides its bounding box into the triangle itself and additional right triangles , and the areas of both the bounding box and the ...

4. 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)

5. Mathematics - Wikipedia

   en.wikipedia.org/wiki/Mathematics

   Some students studying math may develop an apprehension or fear about their performance in the subject. This is known as math anxiety or math phobia, and is considered the most prominent of the disorders impacting academic performance. Math anxiety can develop due to various factors such as parental and teacher attitudes, social stereotypes ...

6. Circle - Wikipedia

   en.wikipedia.org/wiki/Circle

   The circle is the shape with the largest area for a given length of perimeter (see Isoperimetric inequality). The circle is a highly symmetric shape: every line through the centre forms a line of reflection symmetry, and it has rotational symmetry around the centre for every angle. Its symmetry group is the orthogonal group O(2,R).

7. Brahmagupta's formula - Wikipedia

   en.wikipedia.org/wiki/Brahmagupta's_formula

   Heron's formula for the area of a triangle is the special case obtained by taking d = 0. The relationship between the general and extended form of Brahmagupta's formula is similar to how the law of cosines extends the Pythagorean theorem .