Mathematics, 23.07.2021 22:10 squirrel6875

Bài 1. Cho tứ diện SABC có  ABC vuông cân tại B, SA  (ABC), cho SA = a 2 , AB = a. Gọi H, K lần lượt là chân đường vuông góc của A lên các cạnh SB, SC. 1/ Chứng minh : a) BC  (SAB) b) AH  SC c) (SAB)  (SBC). D) SC  (AHK) 2/ Tính góc giữa hai mặt phẳng: a, SB với (ABC) b, (SBC) và (ABC) 3/ Tìm khoảng cách từ A đến (SBC), khoảng cách từ B đến (SAC)

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Bài 1. Cho tứ diện SABC có  ABC vuông cân tại B, SA  (ABC), cho SA = a 2 , AB = a. Gọi H, K lần lư...