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Andrab2ttt
a fost răspuns

Trapezul ABCD are AB||CD, AB-20,CD-15. Ducem EF||AB,E€AD, F€BC,astfel incat DE/EA=2/4. Calculati EF.

Răspuns :

Ovdumi

DE/AE = 1/2

DE/(AE+DE) = 1/3

DE/AD = 1/3

ducem CG║AD, G∈AB

M=EF∩CG

tr CMF asemenea cu CGB

MF/GB=CM/CG

dar  CM=DE si CG=AD iar GB=AB-DC=5

MF=5/3

EF=EM+MF = 15+5/3 = 50/3

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