Ex 11, am nevoie si de desen!
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Teorema inaltimii
AM² = BM·DM => AM = √8·2 = √16 = 4 cm
Teorema catetei
AB² = BM.BD => AB = √8·10 = √80 = 4√5 cm
AD² = DM·BD => AD = √2·10 = √20 = 2√5 cm
(DB = BM + DM = 8 + 2 = 10 cm)
Aria = AD·AD = 4√5·2√5 = 4·2·5 = 40 cm²