Question

In triunghiul ABC, AB = 30 cm, AC = 36 cm, MNparalelAB, M€[AC], N€[BC]. Dacă MN = 10 cm
şi BN= 12 cm, calculați BC; CN, CM.
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Answer 1

Răspuns:

Explicație pas cu pas:

MN//AB =>CM/CA=MN/AB=CN/CB

CM/36=10/30

CM=36*10/30=12 cm

10/30=CN/CN+BN

10/30=CN/CN+12

10(CN+12) =30CN

10CN+120=30CN

20CN=120

CN=10 cm

BC=CN+BN=10+12=22 cm