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2014-08-05T18:53:29+03:00
ΔABC, MN || BC   => ΔAMN  ≈ ΔABC  =>TFa

<=> AM/AB=AN/AC=MN/BC  <=>

<=>2/6= 5/15= 6/BC  <=>

<=> 1/3=1/3 =6/BC   =>BC= 3*6=18 cm
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