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Kimian Hajan Ruventaren
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dsfdsf
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Trịnh Việt Dũng
15 tháng 6 2022 lúc 20:31

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my nguyen
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Yen Nhi
12 tháng 5 2021 lúc 13:00

* Theo mình thì phần a) Góc A = 90 độ sẽ hợp lý hơn chứ. Vậy nên mình sẽ làm theo cả hai góc A 90 độ và 80 độ nhé ( Nhưng bài của mình phần b) sẽ theo góc A = 90 độ )

a)

Góc A = 80 độ thì sẽ có thể tam giác ABC là tam giác cân, tam giác ⊥ tại B hoặc C, tam giác ABC là tam giác tù hoặc tam giác nhọn

Góc A = 90 độ thì tam giác ABC là tam giác vuông tại A

b) 

Theo phần a), ta có: Tam giác ABC cân tại A

=> Góc B = góc C = ( 180 độ - 70 độ ) : 2 = 55 độ

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Bà HOÀng Thả ThÍnh
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Dương Mạnh Quyết
21 tháng 12 2021 lúc 10:21

bài 2:

ta có: AB<AC<BC(Vì 3cm<4cm<5cm)

=> góc C>góc A> góc B (Các cạnh và góc đồi diện trong tam giác)

Bài 3:

*Xét tam giác ABC, có:

       góc A+góc B+góc c= 180 độ( tổng 3 góc 1 tam giác)

hay góc A+60 độ +40 độ=180độ

  => góc A= 180 độ-60 độ-40 độ.

  => góc A=80 độ

Ta có: góc A>góc B>góc C(vì 80 độ>60 độ>40 độ)

        => BC>AC>AB( Các cạnh và góc đối diện trong tam giác)

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Lưu Nguyễn Hà An
15 tháng 2 2022 lúc 9:04

bài 2:

ta có: AB <AC <BC (Vì 3cm <4cm <5cm)

=> góc C>góc A> góc B (Các cạnh và góc đồi diện trong tam giác)

Bài 3:

*Xét tam giác ABC, có:

       góc A+góc B+góc c= 180 độ( tổng 3 góc 1 tam giác)

hay góc A+60 độ +40 độ=180độ

  => góc A= 180 độ-60 độ-40 độ.

  => góc A=80 độ

Ta có: góc A>góc B>góc C(vì 80 độ>60 độ>40 độ)

        => BC>AC>AB( Các cạnh và góc đối diện trong tam giác)

HT mik làm giống bạn Dương Mạnh Quyết

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Đỗ Vũ Nhật Anh
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Duy Nghĩa Hoàng
15 tháng 11 2021 lúc 21:58

Giống mình làm

 

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Quoc Tran Anh Le
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Kiều Sơn Tùng
17 tháng 9 2023 lúc 22:11

a)

Nhận xét: H là một điểm nằm trong tam giác ABC.

b)

Nhận xét: H trùng với đỉnh A của tam giác ABC.

c)

Nhận xét: H nằm ngoài tam giác ABC.

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My Nguyen
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Nguyễn Ngọc Huy Toàn
6 tháng 5 2022 lúc 15:50

tam giác ABC = tam giác ABC:)) đề lạ nhỉ:v

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Bảo An Trịnh
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Nguyễn Lê Phước Thịnh
31 tháng 3 2022 lúc 23:12

a: Xét ΔHBA vuông tại H và ΔABC vuông tại A có

góc B chung

Do đó: ΔHBA∼ΔABC

b: Xét ΔHCA vuôg tại H và ΔACB vuông tại A có

góc C chung

Do đó: ΔHCA∼ΔACB

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Bảo An Trịnh
31 tháng 3 2022 lúc 23:18

mong mọi người giải nhanh

 

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11-8a8 Nguyễn Trung hiếu
31 tháng 3 2022 lúc 23:49

Xét ΔHBA vàΔ ABC có

b chung

a=h=90

=) ΔHBA∼ΔABC(g.g)

Xét ΔHCA và ΔACB có

c chung 

a=h=90

ΔHCA∼ΔACB(g.g)

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Tiến Phạm
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tamanh nguyen
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Nguyễn Hoàng Minh
2 tháng 12 2021 lúc 15:50

\(1,HC=\dfrac{AH^2}{BH}=\dfrac{256}{9}\\ \Rightarrow AB=\sqrt{BH\cdot BC}=\sqrt{\left(\dfrac{256}{9}+9\right)9}=\sqrt{337}\\ 2,BC=\sqrt{AB^2+AC^2}=10\left(cm\right)\\ \Rightarrow BH=\dfrac{AB^2}{BC}=6,4\left(cm\right)\\ 3,AC=\sqrt{BC^2-AB^2}=9\\ \Rightarrow CH=\dfrac{AC^2}{BC}=5,4\\ 4,AC=\sqrt{BC\cdot CH}=\sqrt{9\left(6+9\right)}=3\sqrt{15}\\ 5,AC=\sqrt{BC^2-AB^2}=4\sqrt{7}\left(cm\right)\\ \Rightarrow AH=\dfrac{AB\cdot AC}{BC}=3\sqrt{7}\left(cm\right)\\ 6,AC=\sqrt{BC\cdot CH}=\sqrt{12\left(12+8\right)}=4\sqrt{15}\left(cm\right)\)

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