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Mathematics, 18.09.2021 14:00 sanders8151

Cho hình chóp S ABCD .
có đáy
ABCD
hình chữ nhật,
AB SA a,
AD a 3 , SA ABCD ( ). Tính góc giữa
SD
và
SAB
?

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Cho hình chóp S ABCD .
có đáy
ABCD
hình chữ nhật,
AB SA a,
AD a 3 ,...

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