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Unit 9 Lesson 6 Cofunctions

Authored by Crystal Minott

Mathematics

9th Grade

Unit 9 Lesson 6 Cofunctions
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31 questions

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1.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

In ∆ABC, where ∠C is a right angle,

cos A= √21 ⁄ 5 . What is sin B?

√21 ⁄ 5

√21 ⁄ 2

2 ⁄ 5

5 ⁄ √21

2.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

In ∆ABC, the complement of ∠B is ∠A. Which statement is always true?

tan∠A = tan∠B

sin∠A = sin∠B

cos∠A = tan∠B

sin∠A = cos∠B

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which expression is always equivalent to sin x when 0°< x < 90°?

cos(90°−x)

cos(45°−x)

cos(2x)

cos x

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In right triangle ABC, m∠C =90°. If cos B= 5 ⁄ 13, which function also equals 5 ⁄ 13?

tanA

tanB

sinA

sinB

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

In scalene triangle ABC shown in the diagram above, m∠C = 90°. Which equation is always true?

sinA=sinB

cosA=cosB

cosA=sinC

sinA =cosB

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

If cos 32° = sinx, find the number of degrees in the measure of acute angle x.

32

78

58

68

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Find the value of R that will make the equation sin73°=cosR true when 0°<R<90°.

27

17

45

73

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