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Ước đạt... đo chiều cao nhà "X" hả...chuyện nhỏ

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lytutrong Đăng lúc 13-11-2007 18:54:49
1. Đứng cách xa mục tiêu khoảng gấp hai lần chiều cao phỏng đoán của mục tiêu. Cầm một que, dang tay thẳng cánh tay ra đằng trước hướng về mục tiêu.
2. Đưa ngắm làm sao để đầu mút que trùng với đầu mục tiêu(cột cờ, tháp chuông, tòa nhà, tháp CNTT....)bấn ngón tay ghi dấu chổ ngang mặt đất(như cách ngắm của họa sĩ khi đo mẫu vật)đầu que hay đầu mục tiêu ta gọi là a. chổ bấm ngón tay(hay gốc mục tiêu) ta gọi là O.
3. giử điêm O không xê dịch, các bạn hạ nghiên dần cái que xuống cho đên khi nằm dài trên mặt đất(tưởng như mục tiêu đang ngã xuống). đầu cây que chạm trên mặt đât ta có điểm B(cắm cọc hay cho người đứng tại điểm đó).
4, Đo từ B đến O, chúng ta có chiều cao của mục tiêu

1. Cắm một cây gần mục tiêu muốn đo,
2. Đo xem bóng mục tiêu bằng mấy lân bóng cây rồi nhân lên chúng ta sẽ biết chiều cao của mục tiêu(hoặc dùng công thức như hình vẽ)

1. Dùng một cây gậy mà bạn biết rỏ chiều cao, cắm cách xa mục tiêu tại một điểm bất kỳ.
2. Nằm sát xuống đất và lùi lại cho đến khi các bạn thấy đầu gậy trùng với đỉnh của mục tiêu. Đánh dấu điểm đó (chổ bạn nằm để ngắm).
3. Chúng ta đo đoạn từ chổ ta nằm ngắm đến cây gậy là đoạn O. Đoạn từ chổ ta nằm ngắm đến chân mục tiêu là đoạn D.
4. Nếu H là chiều cao của mục tiêu, B là chiều cao cây gậy thì chúng ta có công thức như hình vẽ.
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jianbin0901 Đăng lúc 1-9-2017 15:53:08
jianbin0901 Đăng lúc 1-9-2017 15:53:41
BobbyCex Đăng lúc 17-1-2018 07:06:52
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BobbyCex Đăng lúc 22-1-2018 17:30:28
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