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Chibi Anh
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Lê Thị Nhung
26 tháng 2 2020 lúc 16:44

Câu 1: C

Câu 2:A

Câu 3:C

Câu 4 C

Câu 5: B

Câu 6 1Đ, 2Đ, 3Đ, 4S

Câu 7: a, Đ

Câu 10 A.

Các câu khác k rõ đề

Khách vãng lai đã xóa
nguyễn duy phong
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Quoc Tran Anh Le
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Kiều Sơn Tùng
17 tháng 9 2023 lúc 22:04

a) Tam giác ABC nhọn:

 

b) Tam giác ABC vuông tại A:

 

c) Tam giác ABC có góc A tù:

Nguyen Thuy Linh
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Nguyen Thuy Linh
10 tháng 1 2016 lúc 15:53

Giúp mình với các bạn ơi mình cần làm gấp để tí nữa đi học thêm nộp cho cô nha. Neu ban nao giai duoc thi minh se an tich cho ban do

Ngọc Tôn Nữ
10 tháng 1 2016 lúc 16:14

tự làm đi.có hình đâu bắt người khác làm

Đỗ Văn Đạt
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Trần Hoàng Minh
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Nguyễn Lê Phước Thịnh
9 tháng 10 2021 lúc 21:37

b: Xét ΔABH vuông tại H và ΔACK vuông tại K có

AB=AC

\(\widehat{A}\) chung

Do đó: ΔABH=ΔACK

Phan M
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Lấp La Lấp Lánh
24 tháng 8 2021 lúc 8:03

Xét tam giác ABC có:

\(\widehat{A}+\widehat{B}+\widehat{C}=180^0\)( tổng 3 góc trong tam giác)

\(\Rightarrow\widehat{B}+\widehat{C}=180^0-\widehat{A}=180^0-70^0=110^0\)

Xét tam giác ABC có:

\(\left\{{}\begin{matrix}\widehat{B}+\widehat{C}=110^0\\\widehat{B}-\widehat{C}=40^0\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\widehat{B}=\left(110^0+40^0\right):2=75^0\\\widehat{C}=\left(110^0-40^0\right):2=35^0\end{matrix}\right.\)

Ta có: \(\widehat{C}< \widehat{A}< \widehat{B}< 90^0\)

Vậy tam giác ABC là tam giác nhọn

Thu Huyền
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Nguyễn Lê Phước Thịnh
27 tháng 5 2023 lúc 7:50

a: sin ACB=AH/AC

=>AH/AC=1/2

=>AH=4cm

b: sin ABC=2/3

=>AH/AB=2/3

=>AB=6cm

HB=căn 6^2-4^2=2căn  5cm

HC=căn 8^2-4^2=4căn  3cm

BC=HB+HC=2căn5+4căn3(cm)

S ABC=1/2*BA*BC*sinB

=1/2*1/2*6*(2căn5+4căn3)

=3(căn 5+2căn 3)