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urgenttt va rooggggg​

Urgenttt Va Rooggggg class=

Răspuns :

∡BAD = 30° => (T30) => AB = 2BD = 18 cm

AD = √AB²-BD² = √324-81 = √243 = 9√2 cm

∡ACB = 30° => tg30 = AD/DC =>

=> DC= AD/tg30 = 3·9√3/√3 = 27 cm

BC = BD + DC = 9 + 27 = 36 cm

AC = √BC²-AB² = √1296-324 = √972 = 18√3 cm

  • P = AB+BC+AC = 18+36+18√3 = 18(3 + √3) cm
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