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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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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)

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

Trần Thị Thu Mến
31 tháng 10 lúc 18:47

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)

Kimian Hajan Ruventaren
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mai Trương
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『Kuroba ム Tsuki Ryoo...
19 tháng 1 2023 lúc 22:02

`a,` vì Tam giác `ABC` có \(\widehat{A}=110^0\) 

`=>` Tam giác `ABC` là tam giác tù.

`b,` Cạnh đối diện của \(\widehat{A}\) là cạnh `BC`

`=>` Cạnh lớn nhất của Tam giác `ABC` là cạnh `BC`loading...

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:

Khánh Băng 7A
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Nguyễn Lê Phước Thịnh
7 tháng 3 2022 lúc 22:31

a: Xét ΔABC vuông tại B và ΔAED vuông tại E có

AC=AD

\(\widehat{A}\) chung

Do đó: ΔABC=ΔAED

b: Đề sai rồi bạn

Chóii Changg
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Quyen Le
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LynnLee
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Nguyễn Lê Phước Thịnh
23 tháng 12 2021 lúc 13:14

a: Áp dụng tính chất của dãy tỉ số bằng nhau, ta được:

\(\dfrac{a}{1}=\dfrac{b}{3}=\dfrac{c}{5}=\dfrac{a+b+c}{1+3+5}=\dfrac{180}{9}=20\)

Do đó: a=20; b=60; c=100

Vậy: ΔABC là tam giác tù