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thuyenkimiuduc
6 tháng trước

Một cột đèn cao 7m có bóng trên mặt đất dài 4m hãy tính góc ( làm tròn đến phút ) mà tia sáng mặt trời tạo với mặt đất

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googlehoidap10
6 tháng trước

Đáp án:

`60°15'`

Giải thích các bước giải:

Góc mà tia mặt trời tạo với mặt đất là:

`tan a = {AB}/{AC} = 7/4` 

   `=>a = 60°15'`

Xem hình ảnh bổ sung bên dưới:

 

KAYK10
6 tháng trước

Đáp án:

$tga$ = $\frac{7}{4}$ ⇒$a$ ≈$60^o15'34^0$ 

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