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<span class="text_page_counter">Trang 1</span><div class="page_container" data-page="1">
Từ M kẻ MH vng góc với cạnh đáy của mặt đứng.
d M P MH
Chú ý: Mặt đứng thường chứa đường cao
[Mã 101 – 2021 lần 1] Cho hình chóp S ABC có đáy là tam giác vng cân tại B , . AB2a và SA vng góc với mặt phẳng đáy. Khoảng cách từ C đến mặt phẳng
Cho hình chóp S ABC , SA vng góc với mặt phẳng.
- Giả sử tam giác ABC vuông tại B .
- Trong mặt phẳng
Mẹo nhớ: Vuông ở đâu, gấp đơi lên ở đó
Cho hình chóp S ABC , SA vng góc với mặt phẳng.
- Trong mặt phẳng
<small>MH</small>
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Cho hình chóp S ABCD , . SB
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IB
</div><span class="text_page_counter">Trang 5</span><div class="page_container" data-page="5">(Đề minh họa 2023) Cho hình chóp đều .S ABCDcó chiều cao
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(Mã 101 -2019) Cho hình chóp .S ABCD có đáy là hình vng cạnh ,a mặt bên SAB là tam giác đều và nằm trong mặt phẳng vng góc với mặt phẳng đáy. Khoảng cách từ A đến mặt phẳng
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Cho hình hộp ABCD A B C D. có đáy ABCD là hình vng cạnh a , tâm O . Hình chiếu vng góc của A lên mặt phẳng
3ah .
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</div><span class="text_page_counter">Trang 7</span><div class="page_container" data-page="7">Bước 1: Tìm mặt phẳng
Bước 3: Trong mặt phẳng
Bước 1: Tìm mặt phẳng
Bước 2: Khi đó: d a b
Bài tốn: Tính khoảng cách giữa hai đường thẳng SA và BC . Cần tính: d d SA BC
Đặt e d A BC
Ta có: SH
<small>KD</small>
</div><span class="text_page_counter">Trang 8</span><div class="page_container" data-page="8">(Đề minh họa 2020) Cho hình chóp
A.
.
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</div><span class="text_page_counter">Trang 9</span><div class="page_container" data-page="9">[Mã 101 - 2023] Cho hình hộp chữ nhật ABCD A B C D.
có AB , 1 BC , 2 AA (tham khảo hình bên). 2Khoảng cách giữa hai đường thẳng AD và DC bằng
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Cho hình chóp
.
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Cho hình chóp S ABC có đáy ABC là tam giác vng tại A , . AB a AC , a 2. Biết thể tích khối chóp S ABC bằng .
. Khoảng cách S từ đến mặt phẳng
Cho hình chóp S ABC có đáy ABC là tam giác vuông tại A , AB a. , AC a 3, SA vng góc với đáy, SA2a. Khoảng cách từ điểm A đến mặt phẳng
3ad .
Cho hình chóp S ABCD có đáy là hình vng cạnh ,. a mặt bên SAB là tam giác đều và nằm trong mặt phẳng vng góc với mặt phẳng đáy. Khoảng cách từ A đến mặt phẳng
Cho hình chóp S ABCD có đáy là hình chữ nhật, cạnh . AB2AD a . Tam giác SAB đều và nằm trong mặt phẳng vng góc với đáy
2a
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