Sine and Cosine Complementary Angles

What is the missing number?
sin(60) = cos(   )

• 10

• 20

• 30

• 40

What is the missing number?
Sin(   ) = Cos(40)

• 30

• 40

• 50

• 60

What is the missing number?
Sin(45) = Cos(   )

• 45

• 95

• 145

• 195

What is the missing number?
Sin(   ) = Cos(80)

• 5

• 10

• 15

• 20

If cos α = sin β, what must be true about α and β?

• α and β are complementary angles

• α and β are congruent angles

• α and β are right angles

If sin x = cos y, what must be true about x and y?

• x + y = 90⁰

• x = y 

• x = 2y

Select all that apply: What is true in respect to the relationship of the sine and cosine of complementary angles? A and B are the acute angles of the right triangle. 

Select all that apply: What is true in respect to the relationship of the sine and cosine of complementary angles? A and B are the acute angles of the right triangle. 

cos 40⁰ = ?

• sin 50⁰

• cos 50⁰

• tan 50⁰

If 𝜃 is the number of degrees of one acute angle in a right triangle, and sin(𝜃) = 3/5 , find cos (90 − 𝜃).

• 3/5

• 5/3

• 3/4

• 4/5