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

Authored by Vi Nguyễn

Other, Mathematics, Fun

10th Grade - University

Used 1+ times

AI Actions

Add similar questions

Adjust reading levels

Convert to real-world scenario

Translate activity

More...

Content View

Student View

40 questions

Show all answers

MULTIPLE CHOICE QUESTION

3 mins • 3 pts

MULTIPLE CHOICE QUESTION

3 mins • 3 pts

Công thức của định lí Sin

MULTIPLE CHOICE QUESTION

3 mins • 5 pts

Tìm x

MULTIPLE CHOICE QUESTION

3 mins • 6 pts

AB = ?

6.1

4.9

MULTIPLE SELECT QUESTION

3 mins • 4 pts

Chọn (những) mệnh đề đúng.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

AC = ?

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.

Access all questions and much more by creating a free account

Create resources

Host any resource

Get auto-graded reports

Continue with Google

Continue with Email

Continue with Classlink

Continue with Clever

or continue with

Microsoft

Apple

Others

Already have an account?

Similar Resources on Wayground

40 questions

تكميليه 135 - 180 ( أ/وليد الجنزوري)0508249931

Quiz

•

1st - 12th Grade

35 questions

SOAL LATIHAN KELAS 2 T5

Quiz

•

2nd Grade

35 questions

PENSAMIENTOMAT_1P

Quiz

•

9th Grade

36 questions

Tìm hiểu Nghị quyết- Final

Quiz

•

Professional Development

44 questions

MATEMATICA

Quiz

•

12th Grade

40 questions

Кулинарный квиз

Quiz

•

5th - 11th Grade

40 questions

自學三科學的頭腦

Quiz

•

8th Grade

40 questions

UJIAN SEKOLAH - MATEMATIKA

Quiz

•

6th Grade

Popular Resources on Wayground

20 questions

STAAR Review Quiz #3

Quiz

•

8th Grade

20 questions

Equivalent Fractions

Quiz

•

3rd Grade

6 questions

Marshmallow Farm Quiz

Quiz

•

2nd - 5th Grade

20 questions

Main Idea and Details

Quiz

•

5th Grade

20 questions

Context Clues

Quiz

•

6th Grade

20 questions

Inferences

Quiz

•

4th Grade

19 questions

Classifying Quadrilaterals

Quiz

•

3rd Grade

12 questions

What makes Nebraska's government unique?

Quiz

•

4th - 5th Grade

Discover more resources for Other

16 questions

Circles - Equations, Central & Inscribed Angles

Quiz

•

9th - 12th Grade

10 questions

Calculating Surface Area of a Triangular Prism

Interactive video

•

6th - 10th Grade

20 questions

Central Angles and Arc Measures 2

Quiz

•

10th Grade

35 questions

Venn Diagrams, Theoretical, & Experimental Review

Quiz

•

9th - 12th Grade

15 questions

Calculate and Classify Arc Measures

Quiz

•

9th - 12th Grade

20 questions

April 1st 2026 Transformations of Rational Functions

Quiz

•

9th - 12th Grade

6 questions

Intro to Step Functions

Quiz

•

10th - 12th Grade

11 questions

Solving Quadratic Equations by Factoring

Quiz

•

9th - 12th Grade