PlzNoToxicBan
23.07.2021 •
Mathematics
Cho tam giác BDC cân tại D, góc C= 30°. M,N,I lần lượt là trung điểm của BD,BC,DC
a) Chứng minh: MNID là hình bình hành
b) Kẻ BA vuông góc với CD( A € CD) . Chứng minh AMNI là hình thang cân và AD= 1/3 AC
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Ответ:
Cho tam giác BDC cân tại D, góc C= 30°. M,N,I lần lượt là trung điểm của BD,BC,DC
a) Chứng minh: MNID là hình bình hành
b) Kẻ BA vuông góc với CD( A € CD) . Chứng minh AMNI là hình thang cân và AD= 1/3 AC
Ответ:
answer:
mew
step-by-step explanation: