Răspuns :
Răspuns:
[tex] \\ \\ \\ \\ [/tex]
Bună,
[tex] \\ \\ \\ \\ [/tex]
[tex]AD=AB-BD \\
[tex]AD=AB-BD \\ AD=28-16 \\
[tex]AD=AB-BD \\ AD=28-16 \\ \green{ AD=12 \: cm.}[/tex]
[tex] \\ [/tex]
DE || BC =>(T. thales)
[tex] \frac{AD}{BD} = \frac{AE}{EC} \\ \frac{12}{16} = \frac{9}{EC} \\ EC = \frac{16 \times 9}{12 } \\ EC = \frac{144}{12} \\ \pink{ EC = 12 \: cm}[/tex]
[tex]AC = AE + EC \\ AC = 9 + 12 \\ \red{ AC = 21 \: cm}[/tex]
[tex] \\ \\ \\ \\ [/tex]
Sper că te-am ajutat.
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