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Front entrance of Lycée Henri-IV, in Paris, one of the famous Lycées providing access to Grandes écoles.. The Classes préparatoires aux grandes écoles (French pronunciation: [klas pʁepaʁatwaʁ o ɡʁɑ̃dz‿ekɔl], Higher school preparatory classes, abbr. CPGE), commonly called classes prépas or prépas, are part of the French post-secondary education system.
The collège is the first level of secondary education in the French educational system.A pupil attending collège is called collégien (boy) or collégienne (girl). Men and women teachers at the collège- and lycée-level are called professeur (no official feminine professional form exists in France although the feminine form "professeure" has appeared and seems to be gaining some ground in ...
The sciences stream (bac S or bac scientifique) requires a high level in mathematics, physics & chemistry, biology & geology and, if available, engineering sciences and computer science. The bac ES (bac économique et social) requires a high level in economics & social sciences; and also in mathematics, history & geography.
Thales’ theorem: if AC is a diameter and B is a point on the diameter's circle, the angle ∠ ABC is a right angle.. 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.