Question

am nevoie acum,va rog​

Answer 1

Răspuns:

Explicație pas cu pas:

DF= 10cm→AF=18-10=8 cm

DE=20cm→EC=35-20=15cm

DE║AM→conform teoremei asemanarii  →Δ ADF≈ ΔAFM

DF/AF= EF/ MF= DE /AM

CN║DF→conform teoremei asemanarii ΔDEF≈ΔCEN

DE/EC= FE/EN =DF/CN

10/8=EF/MF =20/AM

MF=8EF/10=4EF/5

AM= (20*8):10

AM=160:10

AM=16cm

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b)

20/15=EF/EN = 10/CN

EN= 15EF/20

CN= (15*10)/20

CN= 150:20

CN= 7,5 cm

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c)

P ΔBMN= BC+CN+MN+AM+AB

110= 18+7,5+MN+16+35

110-76,5=MN

MN= 33,5 cm