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Mathematics, 26.11.2021 06:40 RandomLollipop

Se considera trapezul ABCD cu unghiul A=B=90 de grade, AD mai mic BC. punctul e este situat pe latura AB, astfel incat unghiul AED=BEC. paralela prin B la de intersecteaza EC in puncrul F, iar unghiul BCE=30 de grade. aratati ca: a) triunghiulBEF este echilateral;
b) punctul Fest emijlocul segmetului CE

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Se considera trapezul ABCD cu unghiul A=B=90 de grade, AD mai mic BC. punctul e este situat pe latur...
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