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  2. Special right triangle - Wikipedia

    en.wikipedia.org/wiki/Special_right_triangle

    Set square shaped as 45° - 45° - 90° triangle The side lengths of a 45° - 45° - 90° triangle 45° - 45° - 90° right triangle of hypotenuse length 1.. In plane geometry, dividing a square along its diagonal results in two isosceles right triangles, each with one right angle (90°, ⁠ π / 2 ⁠ radians) and two other congruent angles each measuring half of a right angle (45°, or ...

  3. Lubuk Layang inscription - Wikipedia

    en.wikipedia.org/wiki/Lubuk_Layang_inscription

    Lubuk Layang inscription, also known as Kubu Sutan inscription, is an inscription found in 1970 in Kubu Sutan, Lubuk Layang, Rao Selatan district, Pasaman Regency, of West Sumatra, Indonesia. [1] [2] The inscription is carved into a sloping sandstone, partially submerged in the ground. [3]

  4. Tamiang Layang - Wikipedia

    en.wikipedia.org/wiki/Tamiang_Layang

    Tamiang Layang is located at the eastern part of Central Kalimantan.To be precise, this town is located at 2.1160 S and 115.1691 E. Tamiang layang is also the most eastern town in Central Kalimantan and this makes it 81 km closer to the city of Banjarbaru, the capital of South Kalimantan than to Palangka Raya City, the capital of its province, Central Kalimantan.

  5. Euler angles - Wikipedia

    en.wikipedia.org/wiki/Euler_angles

    The axes of the original frame are denoted as x, y, z and the axes of the rotated frame as X, Y, Z.The geometrical definition (sometimes referred to as static) begins by defining the line of nodes (N) as the intersection of the planes xy and XY (it can also be defined as the common perpendicular to the axes z and Z and then written as the vector product N = z × Z).

  6. Skinny triangle - Wikipedia

    en.wikipedia.org/wiki/Skinny_triangle

    Fig. 1 Isosceles skinny triangle. In trigonometry, a skinny triangle is a triangle whose height is much greater than its base. The solution of such triangles can be greatly simplified by using the approximation that the sine of a small angle is equal to that angle in radians.

  7. Kite (geometry) - Wikipedia

    en.wikipedia.org/wiki/Kite_(geometry)

    In Euclidean geometry, a kite is a quadrilateral with reflection symmetry across a diagonal.Because of this symmetry, a kite has two equal angles and two pairs of adjacent equal-length sides.

  8. Surface area - Wikipedia

    en.wikipedia.org/wiki/Surface_area

    A sphere of radius r has surface area 4πr 2.. The surface area (symbol A) of a solid object is a measure of the total area that the surface of the object occupies. [1] The mathematical definition of surface area in the presence of curved surfaces is considerably more involved than the definition of arc length of one-dimensional curves, or of the surface area for polyhedra (i.e., objects with ...

  9. Euclidean space - Wikipedia

    en.wikipedia.org/wiki/Euclidean_space

    Euclidean space was introduced by ancient Greeks as an abstraction of our physical space. Their great innovation, appearing in Euclid's Elements was to build and prove all geometry by starting from a few very basic properties, which are abstracted from the physical world, and cannot be mathematically proved because of the lack of more basic tools.