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Trịnh Việt Dũng
15 tháng 6 2022 lúc 20:31

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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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 Khách vãng lai đã xóa
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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The Moon
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The Moon
20 tháng 8 2021 lúc 17:54

GẤP LẮM Ạ,NGAY BÂY GIỜ Ạ

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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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Tiến Phạm
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đào khánh lâm
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Nguyễn Lê Phước Thịnh
10 tháng 3 2022 lúc 21:53

Bài 1: 

a: Xét ΔABC có \(AC^2=AB^2+BC^2\)

nên ΔABC vuông tại B

b: XétΔABC có BC<AB<AC

nên \(\widehat{A}< \widehat{C}< \widehat{B}\)

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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:

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ngọc quỳnh
Xem chi tiết

ΔABC~ΔA'B'C'

=>\(\dfrac{AB}{A'B'}=\dfrac{AC}{A'C'}=\dfrac{BC}{B'C'}\)

=>\(\dfrac{AB}{9}=\dfrac{AC}{12}=\dfrac{BC}{15}\)

=>\(\dfrac{AB}{3}=\dfrac{AC}{4}=\dfrac{BC}{5}\)

=>AB là cạnh nhỏ nhất trong ΔABC

Theo đề, ta có: AB=3cm

=>\(\dfrac{AC}{4}=\dfrac{BC}{5}=\dfrac{3}{3}=1\)

=>\(AC=4\cdot1=4\left(cm\right);BC=5\cdot1=5\left(cm\right)\)

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ha xuan duong
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Nguyễn Lê Phước Thịnh
5 tháng 3 2023 lúc 14:39

Gọi AH,BK,CE lần lượt là các đường cao của ΔABC

Lấy DF,DG,FG lần lượt bằng AH,BK,CE

=>AH:BK:CE=BC:AC:AB(Định lí)

=>AH/BC=BK/AC=CE/AB

=>DF/BC=DG/AC=FG/AB

=>ΔDFG đồng dạng với ΔBCA

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