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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

 

dsfdsf
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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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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

The Moon
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The Moon
20 tháng 8 2021 lúc 17:54

GẤP LẮM Ạ,NGAY BÂY GIỜ Ạ

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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sin nhung
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Nguyễn Quân
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Nguyễn Lê Phước Thịnh
17 tháng 8 2023 lúc 19:32

3:

góc C=90-50=40 độ

Xét ΔABC vuông tại A có sin C=AB/BC

=>4/BC=sin40

=>\(BC\simeq6,22\left(cm\right)\)

\(AC=\sqrt{BC^2-AB^2}\simeq4,76\left(cm\right)\)

1:

góc C=90-60=30 độ

Xét ΔABC vuông tại A có

sin B=AC/BC

=>3/BC=sin60

=>\(BC=\dfrac{3}{sin60}=2\sqrt{3}\left(cm\right)\)

=>\(AB=\dfrac{2\sqrt{3}}{2}=\sqrt{3}\left(cm\right)\)

Trần Thu Ha
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Trần Thị Ngọc Như
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Trần Hương
8 tháng 1 2016 lúc 21:22

dang tung bai di ban 

nhin thay ngai qua

Vu123213
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Nguyễn Lê Phước Thịnh
17 tháng 5 2022 lúc 8:47

\(\widehat{C'}=35^0\)