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In triunghiul ABC construim DE// BC, D∈ (AB),E ∈ (AC), AD=2cm, DB =5cm, EC=10cm. Atunci AB si AE au lungimile de... va rog ajutati-ma



Răspuns :

AB=AD+DB=7 cm
ΔADE≈ΔABC
=>AD/AB=AE/AC
2/7=AE/(AE+10)<=>2AE+20=7AE=>20=5AE=>AE=4 cm