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H24
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TD
15 tháng 6 2022 lúc 20:31

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DA
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DH
15 tháng 11 2021 lúc 21:58

Giống mình làm

 

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TP
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NQ
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NT
23 tháng 1 2024 lúc 14:56

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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QL
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KT
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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BT
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DQ
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
LA
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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TM
31 tháng 10 2024 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)

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DB
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LT
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AH
1 tháng 5 2023 lúc 17:24

Lời giải:
$\widehat{A}+\widehat{B}+\widehat{C}=180^0$ 

$\Rightarrow \widehat{A}=180^0-\widehat{B}-\widehat{C}=180^0-45^0-45^0=90^0$

$\Rightarrow$ tam giác $ABC$ là tam giác vuông tại $A$. Mà $\widehat{B}=\widehat{C}$ nên $ABC$ là tam giác vuông cân ở A

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EY
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PB
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CT
26 tháng 12 2017 lúc 17:35

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