Mathematics, 25.07.2021 06:00 viktoria1198zz
Cho Hình chóp S. ABC Có đáy là tam giac đều cạch a. SA vuông góc với đáy, SA=a . Tính góc giữa SB và mặt phẳng đáy
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Cho Hình chóp S. ABC Có đáy là tam giac đều cạch a. SA vuông góc với đáy, SA=a . Tính góc giữa SB và...
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