Cho tam giác ABC vuông tại a đường cao AH
a) Cho AB=6,AC=8.Tính BC ,AH ,BH
b) Lấy K thuộ...
Mathematics, 18.08.2021 14:00 fireyking19
Cho tam giác ABC vuông tại a đường cao AH
a) Cho AB=6,AC=8.Tính BC ,AH ,BH
b) Lấy K thuộc AC, kẻ AD vuông góc với BK .Chứng minh Tam giác BHK đồng dạng với Tam giác BDC
c) chứng minh BD²/AB²=BH . DC /HK .BK
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