cgonzalez1371
26.11.2021 •
Mathematics
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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