lytranoppo123 lytranoppo123

18-12-2022
Mathematics

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Cho chóp S.ABCD có đáy ABCD là hình bình hành tâm O
Tìm (SAB)∩(SCD) và (SAC)∩(SBD)
Gọi K là trung điểm SA, G là trọng tâm ∆ABC. Tìm J=SO∩(CKG) và I=SD∩(CKG)
CMR GI//(SAB)

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