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2. Heron's formula - Wikipedia

   en.wikipedia.org/wiki/Heron's_formula

   Heron's formula is a special case of Brahmagupta's formula for the area of a cyclic quadrilateral. Heron's formula and Brahmagupta's formula are both special cases of Bretschneider's formula for the area of a quadrilateral. Heron's formula can be obtained from Brahmagupta's formula or Bretschneider's formula by setting one of the sides of the ...

3. Hero of Alexandria - Wikipedia

   en.wikipedia.org/wiki/Hero_of_Alexandria

   He is mostly remembered for Heron's formula; a way to calculate the area of a triangle using only the lengths of its sides. [6] Much of Hero's original writings and designs have been lost, but some of his works were preserved in manuscripts from the Byzantine Empire and, to a lesser extent, in Latin or Arabic translations.

4. Qin Jiushao - Wikipedia

   en.wikipedia.org/wiki/Qin_Jiushao

   This formula is the same as Heron's formula, proved by Heron of Alexandria about 60 BCE, though knowledge of the formula may go back to Archimedes. As precipitation was important agriculture and food production, Qin developed precipitation gauges that was widely used in 1247 during the Mongol Empire / Southern Song dynasty to gather ...

5. 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 .

6. Brahmagupta's formula - Wikipedia

   en.wikipedia.org/wiki/Brahmagupta's_formula

   This formula generalizes Heron's formula for the area of a triangle. A triangle may be regarded as a quadrilateral with one side of length zero. From this perspective, as d approaches zero, a cyclic quadrilateral converges into a cyclic triangle (all triangles are cyclic), and Brahmagupta's formula simplifies to Heron's formula.

7. Licensed practical nurse - Wikipedia

   en.wikipedia.org/wiki/Licensed_practical_nurse

   In the United States, LPN training programs are one to two years in duration. All U.S. state and territorial boards also require passage of the NCLEX-PN exam. In Canada (except for Québec [ 2 ] ), the education program is two years of full-time post-secondary and students must pass the Canadian Practical Nurse Registration Exam (CPNRE), [ 3 ...