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In geometry, a heptagon or septagon is a seven-sided polygon or 7-gon.. The heptagon is sometimes referred to as the septagon, using "sept-" (an elision of septua-, a Latin-derived numerical prefix, rather than hepta-, a Greek-derived numerical prefix; both are cognate) together with the Greek suffix "-agon" meaning angle.
Sinhala had its numerals (Sinhala illakkam), which were used from prior to the fall of Kandyan Kingdom in 1815. They can be seen primarily in Royal documents and artefacts. Sinhala Illakkam did not have a zero, but did have signs for 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 1000. This system has been replaced by the Hindu–Arabic numeral system.
Given two sides a and b and the angle between the sides C, the area of the triangle is given by half the product of the lengths of two sides and the sine of the angle between the two sides: [85] Area = Δ = 1 2 a b sin C {\displaystyle {\mbox{Area}}=\Delta ={\frac {1}{2}}ab\sin C}
In trigonometry, the gradian – also known as the gon (from Ancient Greek γωνία (gōnía) 'angle'), grad, or grade [1] – is a unit of measurement of an angle, defined as one-hundredth of the right angle; in other words, 100 gradians is equal to 90 degrees.
Analytic geometry is the study of geometry using a coordinate system. This contrasts with synthetic geometry . Usually the Cartesian coordinate system is applied to manipulate equations for planes , straight lines , and squares , often in two and sometimes in three dimensions.
In geometry, Thales's theorem states that if A, B, and C are distinct points on a circle where the line AC is a diameter, the angle ∠ ABC is a right angle. Thales's theorem is a special case of the inscribed angle theorem and is mentioned and proved as part of the 31st proposition in the third book of Euclid 's Elements . [ 1 ]
Prince of Wales’ College (native language) Princess of Wales’ College (native language) [11] The first school prize giving was held in 1883 with Sir John Douglas as the chief guest. There were prize records for all four schools. Prince of Wales’ College and Prince of Wales’ College (native) only had classes up to Grade 7.
Galahitiyawa Central College (GCC) (Sinhala: ගලහිටියාව මධ්ය විද්යාලය) is a National school in Ganemulla, Sri Lanka belonging to the category of Central Colleges of Sri Lanka. It was established in May 1944.
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