Muốn dùng Định lý Cos cần biết

một góc và cạnh đối diện

Cho hai góc nhọn α \alpha α và β \beta β phụ nhau. Hệ thức nào sau đây là sai?

cot ⁡ β = − tan ⁡ α \cot\beta=-\tan\alpha cot β = − tan α

cot ⁡ α = tan ⁡ β \cot\alpha=\tan\beta cot α = tan β

cos ⁡ α = sin ⁡ β \cos\alpha=\sin\beta cos α = sin β

cos ⁡ β = sin ⁡ α \cos\beta=\sin\alpha cos β = sin α

tan ⁡ ( 165 ° ) = ? \tan\left(165\degree\right)=? tan ( 1 6 5 ° ) = ?

− tan ⁡ 15 ° -\tan15\degree − tan 1 5 °

tan ⁡ 15 ° \tan15\degree tan 1 5 °

cot ⁡ 15 ° \cot15\degree cot 1 5 °

− cot ⁡ 15 ° -\cot15\degree − cot 1 5 °

Cho Δ A B C \Delta ABC Δ A B C , kết luận nào sau đây là đúng

S A B C = 1 2 B C . C A . sin ⁡ C S_{ABC}=\frac{1}{2}BC.CA.\sin C S A B C = 2 1 B C . C A . sin C

S A B C = 1 2 B C . C A . cos ⁡ C S_{ABC}=\frac{1}{2}BC.CA.\cos C S A B C = 2 1 B C . C A . cos C

S A B C = 1 2 B C . A B . cos ⁡ C S_{ABC}=\frac{1}{2}BC.AB.\cos C S A B C = 2 1 B C . A B . cos C

S A B C = 1 2 B C . A B . sin ⁡ C S_{ABC}=\frac{1}{2}BC.AB.\sin C S A B C = 2 1 B C . A B . sin C

HỆ THỨC LƯỢNG TRONG TAM GIÁC

Quiz

•

Other, Mathematics, Fun

•

10th Grade - University

•

Practice Problem

•

Medium

Vi Nguyễn

Used 1+ times

FREE Resource

40 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

3 mins • 3 pts

2.

MULTIPLE CHOICE QUESTION

3 mins • 3 pts

Công thức của định lí Sin

3.

MULTIPLE CHOICE QUESTION

3 mins • 5 pts

Tìm x

52

33

41

29

4.

MULTIPLE CHOICE QUESTION

3 mins • 6 pts

AB = ?

10

8

6.1

4.9

5.

MULTIPLE SELECT QUESTION

3 mins • 4 pts

Chọn (những) mệnh đề đúng.

6.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

AC = ?

12

10

23

14

7.

MULTIPLE CHOICE QUESTION

3 mins • 5 pts

Tại sao bạn KHÔNG thể giải tam giác bằng cách sử dụng định luật sin?

Chưa biết các cạnh.

Không có góc vuông.

Độ dài được tính bằng cm.

Chưa biết các góc.

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