The Circle

What is cos 90°?

• ½

• undefined

• 1

• 0

Which of the following is the equation of a unit circle?

• x² + y² = 0

• x² + y² = 1

• (x + 1)² + y² = 1

• (x + 1)² + (y + 1)² = 1

What is cos 60°?

• ½

• ^√3/₂

• ^√2/₂

• 1

What is sin 45°?

• 1
• ^√3/₂
• ½
• ^√2/₂

What is sin 30°?

• ^√3/₂

• 1

• ½

• ^√2/₂

What is sin 90°?

• 1
• 0
• undefined
• ½

How many degrees is ^π/₆ radians?

• 90°

• 60°

• 45°

• 30°

How many degrees is ^π/₄ radians?

• 30°

• 45°

• 60°

• 90°

How many degrees is ^π/₂ radians?

• 30°

• 45°

• 60°

• 90°

How many degrees is ^π/₃ radians?

• 30°

• 45°

• 60°

• 90°