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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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sin nhung
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cao nguyễn thu uyên
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hoang khanh vy
29 tháng 12 2015 lúc 19:09

minh vua tik ban do , ban tik lai minh di

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

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

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

Dương Khánh Huyền
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Võ Huỳnh Vi Na
26 tháng 7 2016 lúc 7:55

ko biết. k mik nha

Võ Huỳnh Vi Na
26 tháng 7 2016 lúc 8:07

Khánh Huyền k mik nha

Dương Khánh Huyền
26 tháng 7 2016 lúc 9:35

ai vẽ hình giúp mk câu 1 đc ko

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

Lê Thị Kiều Trinh
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Đào Trọng Chân
20 tháng 1 2017 lúc 15:48

Tam giác có ba góc bằng nhau thì đó là tam giác đều. Mà tổng ba góc trong một tam giác bằng 180 độ

Do đó: góc A=góc B=góc C= 180 độ : 3= 60 độ

Số đo mỗi góc trong tam giác ABC bằng 60 độ bạn nhé

Vũ Như Mai
20 tháng 1 2017 lúc 15:43

Xét tam giác ABC có góc A = góc B = góc C

=> tam giác ABC là tam giác đều

=> Góc A = góc B = góc C = 60 độ

Triệu Nguyễn Gia Huy
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phạm hà anh
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Nguyen khanh huyen
2 tháng 12 2016 lúc 16:00

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