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va rogggg repede dau coroana​

Va Rogggg Repede Dau Coroana class=

Răspuns :

Răspuns:

a)∆ABC≈∆AMN

raportul de asemănare fiind 2/3

AM/AB=AN/AC=MN/BC=/2/3

AM=2×18/3=12cm

AN=2×21/3=14cm

MN=2×15/3=10cm

P∆AMN=12+14+10=36cm

b)P∆ABC=(36/2)×3=108/2=54cm

deoarece P∆ABC/P∆AMN=2/3