hn735958 hn735958
  • 23-10-2021
  • Mathematics
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Trong cơn bão số 9 vừa qua. Một cột điện cao 9m bị gió bão làm gãy ngang thân, ngọn của cột điện chạm đất cách gốc 3m. Hỏi điểm gãy cách gốc bao nhiêu mét?

Respuesta :

haohaoxNienie
haohaoxNienie haohaoxNienie
  • 23-10-2021

AB=9m and BC=3m

Using Pythagoras theorem, In ΔABC

(AC)² +(AB)² +(BC)²

⇒(AC)² =(9)² + (5)²

⇒(AC)² =81 + 25

⇒(AC)² =106

⇒AC=10.3m

=AC+CB=10.3+3=13.3m

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