Sine and Cosine (Angles)

What is the missing number?
Sin(90) = Cos(   )

• 0

• 10

• 20

• 30

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

• α and β are supplementary angles

Solve for x. cos(2x +9) = sin(x)

• x = 27

• x = -9

• x = 57

• x = 9

What is the complement to: cos 40⁰ = ?

• sin 50⁰

• cos 50⁰

• tan 50⁰

• sin 40⁰

What is the complement to: sin 20⁰ = ?

• cos 70⁰

• sin 70⁰

• cos 20⁰

• tan 20⁰

What is the complement to: cos 38⁰ = ?

• sin 62⁰

• sin 52⁰

• cos 52⁰

• sin 38⁰

What is the complement to: sin 1⁰ = ?

• cos 89⁰

• cos 1⁰

• sin 89⁰

• tan 1⁰